diff --git a/Cargo.lock b/Cargo.lock
index df20db78..601cf1e3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -221,6 +221,7 @@ dependencies = [
  "interner",
  "itertools",
  "logos",
+ "stacker",
  "stdext",
  "walkdir",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 2a01684a..bee2641f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,6 +29,7 @@ indexmap = "2.2.3"
 interner = "0.2.1"
 itertools = "0.11.0"
 logos = "0.14.0"
+stacker = "0.1"
 
 [dev-dependencies]
 insta = "1.34.0"
diff --git a/aircraft.hvm2 b/aircraft.hvm2
new file mode 100644
index 00000000..32177fa9
--- /dev/null
+++ b/aircraft.hvm2
@@ -0,0 +1,5 @@
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+data Tree = (Node lt rt rd ld) | (Leaf val)
+
+
+main = matrix
\ No newline at end of file
diff --git a/gen.hvm b/gen.hvm
new file mode 100644
index 00000000..013ae892
--- /dev/null
+++ b/gen.hvm
@@ -0,0 +1,4 @@
+MakeLongStr 0   acc = acc
+MakeLongStr 1+p acc = (String.cons '*' (MakeLongStr p acc))
+
+main = (MakeLongStr 16339 String.nil)
\ No newline at end of file
diff --git a/huge_str.hvm b/huge_str.hvm
new file mode 100644
index 00000000..21c459db
--- /dev/null
+++ b/huge_str.hvm
@@ -0,0 +1 @@
+main = "(Node ((Node ((Node ((Node ((Node ((Node ((Node ((Node ((Node ((Node ((Node ((Node ((Node (Leaf (1)) (Leaf (1)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (1)) (Leaf (1)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)))) ((Node ((Node (Leaf (1)) (Leaf (0)) (Leaf (0)) (Leaf (1)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (1)) (Leaf (1)))) (Leaf (0)) (Leaf (0)))) ((Node ((Node (Leaf (16)) (Leaf (0)) (Leaf (0)) (Leaf (15)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (28)) (Leaf (0)) (Leaf (0)) (Leaf (23)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (10)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (14)) (Leaf (0)) (Leaf (0)) (Leaf (15)))))))) ((Node ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (1)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (1)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (1)) (Leaf (1)) (Leaf (0)) (Leaf (0)))))) ((Node (Leaf (0)) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (1)) (Leaf (1)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (1)) (Leaf (1)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) 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(0)) (Leaf (0)) (Leaf (11)))) (Leaf (0)))) ((Node (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (7)) (Leaf (0)))) ((Node (Leaf (57)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (29)) (Leaf (0)) (Leaf (0)))))) ((Node (Leaf (0)) ((Node (Leaf (22)) (Leaf (0)) (Leaf (0)) (Leaf (17)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (9)) (Leaf (0)))) (Leaf (0)))))) ((Node ((Node ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (28)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (23)) (Leaf (0)) (Leaf (0)))))) ((Node ((Node (Leaf (0)) (Leaf (10)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (14)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (81)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))))) ((Node ((Node (Leaf (16)) (Leaf (0)) (Leaf (0)) (Leaf (15)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (28)) (Leaf (0)) (Leaf (0)) (Leaf (23)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (10)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (14)) (Leaf (0)) (Leaf (0)) (Leaf (15)))))))) ((Node ((Node ((Node (Leaf (0)) (Leaf (5)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (57)) (Leaf (0)))) ((Node (Leaf (7)) (Leaf (0)) (Leaf (0)) (Leaf (29)))))) ((Node ((Node (Leaf (0)) (Leaf (11)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (22)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (17)) (Leaf (0)) (Leaf (0)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (5)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (7)) (Leaf (0)))))) ((Node ((Node (Leaf (9)) (Leaf (0)) (Leaf (0)) (Leaf (11)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (22)) (Leaf (0)) (Leaf (0)) (Leaf (17)))))))))) ((Node ((Node ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (55)) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) ((Node (Leaf (55)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) ((Node ((Node (Leaf (0)) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (55)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) ((Node ((Node ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (16)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (28)) (Leaf (0)))))) ((Node ((Node (Leaf (81)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (10)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (14)) (Leaf (0)))))) ((Node (Leaf (0)) ((Node (Leaf (0)) (Leaf (23)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (16)) (Leaf (0)) (Leaf (0)) (Leaf (15)))) (Leaf (0)))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (81)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (10)))) (Leaf (0)))))) ((Node ((Node ((Node (Leaf (57)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (29)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (5)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (9)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (11)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (22)) (Leaf (0)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (57)) (Leaf (0)))) ((Node (Leaf (7)) (Leaf (0)) (Leaf (0)) (Leaf (29)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (5)))) (Leaf (0)))) ((Node (Leaf (0)) ((Node (Leaf (0)) (Leaf (17)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (9)) (Leaf (0)) (Leaf (0)) (Leaf (11)))) (Leaf (0)))))) ((Node ((Node (Leaf (0)) ((Node (Leaf (28)) (Leaf (0)) (Leaf (0)) (Leaf (23)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (16)) (Leaf (0)))) (Leaf (0)))) ((Node (Leaf (0)) ((Node (Leaf (14)) (Leaf (0)) (Leaf (0)) (Leaf (15)))) ((Node (Leaf (81)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) ((Node ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (28)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (23)) (Leaf (0)) (Leaf (0)))))) ((Node ((Node (Leaf (0)) (Leaf (10)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (14)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (81)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))))))) ((Node ((Node (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (7)) (Leaf (0)))) ((Node (Leaf (57)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (29)) (Leaf (0)) (Leaf (0)))))) ((Node (Leaf (0)) ((Node (Leaf (22)) (Leaf (0)) (Leaf (0)) (Leaf (17)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (9)) (Leaf (0)))) (Leaf (0)))) ((Node ((Node (Leaf (0)) (Leaf (5)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (57)) (Leaf (0)))) ((Node (Leaf (7)) (Leaf (0)) (Leaf (0)) (Leaf (29)))))) ((Node ((Node (Leaf (0)) (Leaf (11)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (22)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (17)) (Leaf (0)) (Leaf (0)))))))))) ((Node ((Node ((Node ((Node (Leaf (55)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (55)) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) ((Node ((Node (Leaf (0)) (Leaf (0)) ((Node (Leaf (55)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (55)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)))) (Leaf (0)))))) (Leaf (0)) ((Node ((Node ((Node ((Node ((Node (Leaf (16)) (Leaf (0)) (Leaf (0)) (Leaf (15)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (28)) (Leaf (0)) (Leaf (0)) (Leaf (23)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (10)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (14)) (Leaf (0)) (Leaf (0)) (Leaf (15)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (16)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (28)) (Leaf (0)))))) ((Node ((Node (Leaf (81)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (10)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (14)) (Leaf (0)))))))) ((Node ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (0)) (Leaf (5)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (0)) (Leaf (0)) (Leaf (7)) (Leaf (0)))))) ((Node ((Node (Leaf (9)) (Leaf (0)) (Leaf (0)) (Leaf (11)))) (Leaf (0)) (Leaf (0)) ((Node (Leaf (22)) (Leaf (0)) (Leaf (0)) (Leaf (17)))))) ((Node ((Node (Leaf (57)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (29)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (5)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (9)) (Leaf (0)))) (Leaf (0)) ((Node (Leaf (0)) (Leaf (11)) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (0)) (Leaf (22)) (Leaf (0)))))))) ((Node ((Node (Leaf (0)) ((Node (Leaf (0)) (Leaf (23)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)))) ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (81)) (Leaf (0)))) ((Node (Leaf (0)) (Leaf (15)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)))) ((Node ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (57)) (Leaf (0)))) ((Node (Leaf (7)) (Leaf (0)) (Leaf (0)) (Leaf (29)))) (Leaf (0)) (Leaf (0)))) ((Node (Leaf (0)) ((Node (Leaf (0)) (Leaf (17)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)))))) ((Node ((Node (Leaf (0)) (Leaf (0)) ((Node ((Node (Leaf (55)) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) ((Node ((Node ((Node (Leaf (0)) (Leaf (0)) (Leaf (55)) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))) (Leaf (0)))) (Leaf (0)))) (Leaf (0)))) (Leaf (0)) (Leaf (0)) (Leaf (0)))"
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index df68be3c..033f242e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -80,7 +80,7 @@ pub fn create_host(book: Arc<Book>, labels: Arc<Labels>, compile_opts: CompileOp
         term.resugar_builtins();
 
         readback_errors.extend(resugar_errs);
-        if let Term::Str { val } = term {
+        if let Term::Str { ref val } = term {
           println!("{val}");
         }
       }
diff --git a/src/term/check/ctrs_arities.rs b/src/term/check/ctrs_arities.rs
index 153416f5..de89ccf4 100644
--- a/src/term/check/ctrs_arities.rs
+++ b/src/term/check/ctrs_arities.rs
@@ -75,46 +75,48 @@ impl Pattern {
 
 impl Term {
   pub fn check_ctrs_arities(&self, arities: &HashMap<Name, usize>) -> Result<(), MatchErr> {
-    match self {
-      Term::Mat { args, rules } => {
-        for arg in args {
-          arg.check_ctrs_arities(arities)?;
-        }
-        for rule in rules {
-          for pat in &rule.pats {
-            pat.check_ctrs_arities(arities)?;
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match self {
+        Term::Mat { args, rules } => {
+          for arg in args {
+            arg.check_ctrs_arities(arities)?;
+          }
+          for rule in rules {
+            for pat in &rule.pats {
+              pat.check_ctrs_arities(arities)?;
+            }
+            rule.body.check_ctrs_arities(arities)?;
           }
-          rule.body.check_ctrs_arities(arities)?;
         }
-      }
-      Term::Let { pat, val, nxt } => {
-        pat.check_ctrs_arities(arities)?;
-        val.check_ctrs_arities(arities)?;
-        nxt.check_ctrs_arities(arities)?;
-      }
+        Term::Let { pat, val, nxt } => {
+          pat.check_ctrs_arities(arities)?;
+          val.check_ctrs_arities(arities)?;
+          nxt.check_ctrs_arities(arities)?;
+        }
 
-      Term::Lst { els } => {
-        for el in els {
-          el.check_ctrs_arities(arities)?;
+        Term::Lst { els } => {
+          for el in els {
+            el.check_ctrs_arities(arities)?;
+          }
         }
+        Term::App { fun: fst, arg: snd, .. }
+        | Term::Tup { fst, snd }
+        | Term::Dup { val: fst, nxt: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Opx { fst, snd, .. } => {
+          fst.check_ctrs_arities(arities)?;
+          snd.check_ctrs_arities(arities)?;
+        }
+        Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.check_ctrs_arities(arities)?,
+        Term::Var { .. }
+        | Term::Lnk { .. }
+        | Term::Num { .. }
+        | Term::Str { .. }
+        | Term::Ref { .. }
+        | Term::Era
+        | Term::Err => {}
       }
-      Term::App { fun: fst, arg: snd, .. }
-      | Term::Tup { fst, snd }
-      | Term::Dup { val: fst, nxt: snd, .. }
-      | Term::Sup { fst, snd, .. }
-      | Term::Opx { fst, snd, .. } => {
-        fst.check_ctrs_arities(arities)?;
-        snd.check_ctrs_arities(arities)?;
-      }
-      Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.check_ctrs_arities(arities)?,
-      Term::Var { .. }
-      | Term::Lnk { .. }
-      | Term::Num { .. }
-      | Term::Str { .. }
-      | Term::Ref { .. }
-      | Term::Era
-      | Term::Err => {}
-    }
-    Ok(())
+      Ok(())
+    })
   }
 }
diff --git a/src/term/check/match_arity.rs b/src/term/check/match_arity.rs
index 6d5a7166..b60cabb9 100644
--- a/src/term/check/match_arity.rs
+++ b/src/term/check/match_arity.rs
@@ -33,41 +33,43 @@ impl Definition {
 
 impl Term {
   pub fn check_match_arity(&self) -> Result<(), MatchErr> {
-    match self {
-      Term::Mat { args, rules } => {
-        let expected = args.len();
-        for rule in rules {
-          let found = rule.pats.len();
-          if found != expected {
-            return Err(MatchErr::ArityMismatch(found, expected));
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match self {
+        Term::Mat { args, rules } => {
+          let expected = args.len();
+          for rule in rules {
+            let found = rule.pats.len();
+            if found != expected {
+              return Err(MatchErr::ArityMismatch(found, expected));
+            }
+            rule.body.check_match_arity()?;
           }
-          rule.body.check_match_arity()?;
         }
-      }
 
-      Term::Lst { els } => {
-        for el in els {
-          el.check_match_arity()?;
+        Term::Lst { els } => {
+          for el in els {
+            el.check_match_arity()?;
+          }
         }
+        Term::App { fun: fst, arg: snd, .. }
+        | Term::Tup { fst, snd }
+        | Term::Dup { val: fst, nxt: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Opx { fst, snd, .. }
+        | Term::Let { val: fst, nxt: snd, .. } => {
+          fst.check_match_arity()?;
+          snd.check_match_arity()?;
+        }
+        Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.check_match_arity()?,
+        Term::Var { .. }
+        | Term::Lnk { .. }
+        | Term::Num { .. }
+        | Term::Str { .. }
+        | Term::Ref { .. }
+        | Term::Era
+        | Term::Err => {}
       }
-      Term::App { fun: fst, arg: snd, .. }
-      | Term::Tup { fst, snd }
-      | Term::Dup { val: fst, nxt: snd, .. }
-      | Term::Sup { fst, snd, .. }
-      | Term::Opx { fst, snd, .. }
-      | Term::Let { val: fst, nxt: snd, .. } => {
-        fst.check_match_arity()?;
-        snd.check_match_arity()?;
-      }
-      Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.check_match_arity()?,
-      Term::Var { .. }
-      | Term::Lnk { .. }
-      | Term::Num { .. }
-      | Term::Str { .. }
-      | Term::Ref { .. }
-      | Term::Era
-      | Term::Err => {}
-    }
-    Ok(())
+      Ok(())
+    })
   }
 }
diff --git a/src/term/check/unbound_pats.rs b/src/term/check/unbound_pats.rs
index a45db6c1..a42f3aa3 100644
--- a/src/term/check/unbound_pats.rs
+++ b/src/term/check/unbound_pats.rs
@@ -67,41 +67,43 @@ impl Pattern {
 
 impl Term {
   pub fn check_unbound_pats(&self, is_ctr: &impl Fn(&Name) -> bool) -> Result<(), UnboundCtrErr> {
-    match self {
-      Term::Let { pat, val, nxt } => {
-        pat.check_unbounds(is_ctr)?;
-        val.check_unbound_pats(is_ctr)?;
-        nxt.check_unbound_pats(is_ctr)?;
-      }
-      Term::Mat { args, rules } => {
-        for arg in args {
-          arg.check_unbound_pats(is_ctr)?;
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match self {
+        Term::Let { pat, val, nxt } => {
+          pat.check_unbounds(is_ctr)?;
+          val.check_unbound_pats(is_ctr)?;
+          nxt.check_unbound_pats(is_ctr)?;
         }
-        for rule in rules {
-          for pat in &rule.pats {
-            pat.check_unbounds(is_ctr)?;
+        Term::Mat { args, rules } => {
+          for arg in args {
+            arg.check_unbound_pats(is_ctr)?;
+          }
+          for rule in rules {
+            for pat in &rule.pats {
+              pat.check_unbounds(is_ctr)?;
+            }
+            rule.body.check_unbound_pats(is_ctr)?;
           }
-          rule.body.check_unbound_pats(is_ctr)?;
         }
+        Term::App { fun: fst, arg: snd, .. }
+        | Term::Tup { fst, snd }
+        | Term::Dup { val: fst, nxt: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Opx { fst, snd, .. } => {
+          fst.check_unbound_pats(is_ctr)?;
+          snd.check_unbound_pats(is_ctr)?;
+        }
+        Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.check_unbound_pats(is_ctr)?,
+        Term::Lst { .. } => unreachable!(),
+        Term::Var { .. }
+        | Term::Lnk { .. }
+        | Term::Ref { .. }
+        | Term::Num { .. }
+        | Term::Str { .. }
+        | Term::Era
+        | Term::Err => (),
       }
-      Term::App { fun: fst, arg: snd, .. }
-      | Term::Tup { fst, snd }
-      | Term::Dup { val: fst, nxt: snd, .. }
-      | Term::Sup { fst, snd, .. }
-      | Term::Opx { fst, snd, .. } => {
-        fst.check_unbound_pats(is_ctr)?;
-        snd.check_unbound_pats(is_ctr)?;
-      }
-      Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.check_unbound_pats(is_ctr)?,
-      Term::Lst { .. } => unreachable!(),
-      Term::Var { .. }
-      | Term::Lnk { .. }
-      | Term::Ref { .. }
-      | Term::Num { .. }
-      | Term::Str { .. }
-      | Term::Era
-      | Term::Err => (),
-    }
-    Ok(())
+      Ok(())
+    })
   }
 }
diff --git a/src/term/mod.rs b/src/term/mod.rs
index 3665dc0b..66556a53 100644
--- a/src/term/mod.rs
+++ b/src/term/mod.rs
@@ -140,6 +140,44 @@ pub enum Term {
   Err,
 }
 
+impl Drop for Term {
+  fn drop(&mut self) {
+    let mut stack = vec![self];
+
+    while let Some(term) = stack.pop() {
+      match term {
+        Term::Lam { bod, .. } | Term::Chn { bod, .. } => {
+          stack.push(bod);
+        }
+        Term::Let { val: fst, nxt: snd, .. }
+        | Term::App { fun: fst, arg: snd, .. }
+        | Term::Tup { fst, snd }
+        | Term::Dup { val: fst, nxt: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Opx { fst, snd, .. } => {
+          stack.push(fst);
+          stack.push(snd);
+        }
+        Term::Mat { args, rules } => {
+          for arg in args.iter_mut() {
+            stack.push(arg);
+          }
+
+          for Rule { body, .. } in rules.iter_mut() {
+            stack.push(body);
+          }
+        }
+        Term::Lst { els } => {
+          for el in els.iter_mut() {
+            stack.push(el);
+          }
+        }
+        _ => {}
+      }
+    }
+  }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum Pattern {
   Var(Option<Name>),
diff --git a/src/term/net_to_term.rs b/src/term/net_to_term.rs
index f9b8b68d..a802221b 100644
--- a/src/term/net_to_term.rs
+++ b/src/term/net_to_term.rs
@@ -58,162 +58,166 @@ pub struct Reader<'a> {
 
 impl<'a> Reader<'a> {
   fn read_term(&mut self, next: Port) -> Term {
-    if self.dup_paths.is_none() && !self.seen.insert(next) {
-      self.error(ReadbackError::Cyclic);
-      return Term::Var { nam: Name::from("...") };
-    }
-
-    let node = next.node();
-
-    let term = match &self.net.node(node).kind {
-      Era => {
-        // Only the main port actually exists in an ERA, the aux ports are just an artifact of this representation.
-        debug_assert!(next.slot() == 0);
-        Term::Era
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      if self.dup_paths.is_none() && !self.seen.insert(next) {
+        self.error(ReadbackError::Cyclic);
+        return Term::Var { nam: Name::from("...") };
       }
-      // If we're visiting a con node...
-      Con { lab } => match next.slot() {
-        // If we're visiting a port 0, then it is a lambda.
-        0 => {
-          let nam = self.namegen.decl_name(self.net, Port(node, 1));
-          let bod = self.read_term(self.net.enter_port(Port(node, 2)));
-          Term::Lam { tag: self.labels.con.to_tag(*lab), nam, bod: Box::new(bod) }
+
+      let node = next.node();
+
+      let term = match &self.net.node(node).kind {
+        Era => {
+          // Only the main port actually exists in an ERA, the aux ports are just an artifact of this representation.
+          debug_assert!(next.slot() == 0);
+          Term::Era
         }
-        // If we're visiting a port 1, then it is a variable.
-        1 => Term::Var { nam: self.namegen.var_name(next) },
-        // If we're visiting a port 2, then it is an application.
-        2 => {
-          let fun = self.read_term(self.net.enter_port(Port(node, 0)));
-          let arg = self.read_term(self.net.enter_port(Port(node, 1)));
-          Term::App { tag: self.labels.con.to_tag(*lab), fun: Box::new(fun), arg: Box::new(arg) }
-        }
-        _ => unreachable!(),
-      },
-      Mat => match next.slot() {
-        2 => {
-          // Read the matched expression
-          let scrutinee = self.read_term(self.net.enter_port(Port(node, 0)));
+        // If we're visiting a con node...
+        Con { lab } => match next.slot() {
+          // If we're visiting a port 0, then it is a lambda.
+          0 => {
+            let nam = self.namegen.decl_name(self.net, Port(node, 1));
+            let bod = self.read_term(self.net.enter_port(Port(node, 2)));
+            Term::Lam { tag: self.labels.con.to_tag(*lab), nam, bod: Box::new(bod) }
+          }
+          // If we're visiting a port 1, then it is a variable.
+          1 => Term::Var { nam: self.namegen.var_name(next) },
+          // If we're visiting a port 2, then it is an application.
+          2 => {
+            let fun = self.read_term(self.net.enter_port(Port(node, 0)));
+            let arg = self.read_term(self.net.enter_port(Port(node, 1)));
+            Term::App { tag: self.labels.con.to_tag(*lab), fun: Box::new(fun), arg: Box::new(arg) }
+          }
+          _ => unreachable!(),
+        },
+        Mat => match next.slot() {
+          2 => {
+            // Read the matched expression
+            let scrutinee = self.read_term(self.net.enter_port(Port(node, 0)));
 
-          // Read the pattern matching node
-          let sel_node = self.net.enter_port(Port(node, 1)).node();
+            // Read the pattern matching node
+            let sel_node = self.net.enter_port(Port(node, 1)).node();
 
-          // We expect the pattern matching node to be a CON
-          let sel_kind = &self.net.node(sel_node).kind;
-          if *sel_kind != (Con { lab: None }) {
-            // TODO: Is there any case where we expect a different node type here on readback?
-            self.error(ReadbackError::InvalidNumericMatch);
-            Term::native_num_match(scrutinee, Term::Era, Term::Era, None)
-          } else {
-            let zero_term = self.read_term(self.net.enter_port(Port(sel_node, 1)));
-            let succ_term = self.read_term(self.net.enter_port(Port(sel_node, 2)));
+            // We expect the pattern matching node to be a CON
+            let sel_kind = &self.net.node(sel_node).kind;
+            if *sel_kind != (Con { lab: None }) {
+              // TODO: Is there any case where we expect a different node type here on readback?
+              self.error(ReadbackError::InvalidNumericMatch);
+              Term::native_num_match(scrutinee, Term::Era, Term::Era, None)
+            } else {
+              let zero_term = self.read_term(self.net.enter_port(Port(sel_node, 1)));
+              let mut succ_term = self.read_term(self.net.enter_port(Port(sel_node, 2)));
 
-            match succ_term {
-              Term::Lam { nam, bod, .. } => Term::native_num_match(scrutinee, zero_term, *bod, Some(nam)),
-              _ => {
-                self.error(ReadbackError::InvalidNumericMatch);
-                Term::native_num_match(scrutinee, zero_term, succ_term, None)
+              match &mut succ_term {
+                Term::Lam { nam, bod, .. } => {
+                  Term::native_num_match(scrutinee, zero_term, std::mem::take(bod), Some(nam.take()))
+                }
+                _ => {
+                  self.error(ReadbackError::InvalidNumericMatch);
+                  Term::native_num_match(scrutinee, zero_term, succ_term, None)
+                }
               }
             }
           }
-        }
-        _ => {
-          self.error(ReadbackError::InvalidNumericMatch);
-          Term::Err
-        }
-      },
-      Ref { def_name } => {
-        if def_name.is_generated() {
-          // Dereference generated names since the user is not aware of them
-          let def = &self.book.defs[def_name];
-          let mut term = def.rule().body.clone();
-          term.fix_names(&mut self.namegen.id_counter, self.book);
+          _ => {
+            self.error(ReadbackError::InvalidNumericMatch);
+            Term::Err
+          }
+        },
+        Ref { def_name } => {
+          if def_name.is_generated() {
+            // Dereference generated names since the user is not aware of them
+            let def = &self.book.defs[def_name];
+            let mut term = def.rule().body.clone();
+            term.fix_names(&mut self.namegen.id_counter, self.book);
 
-          term
-        } else {
-          Term::Ref { nam: def_name.clone() }
+            term
+          } else {
+            Term::Ref { nam: def_name.clone() }
+          }
         }
-      }
-      // If we're visiting a fan node...
-      Dup { lab } => match next.slot() {
-        // If we're visiting a port 0, then it is a pair.
-        0 => {
-          if let Some(dup_paths) = &mut self.dup_paths {
-            let stack = dup_paths.entry(*lab).or_default();
-            if let Some(slot) = stack.pop() {
-              // Since we had a paired Dup in the path to this Sup,
-              // we "decay" the superposition according to the original direction we came from the Dup.
-              let term = self.read_term(self.net.enter_port(Port(node, slot)));
-              self.dup_paths.as_mut().unwrap().get_mut(lab).unwrap().push(slot);
-              Some(term)
+        // If we're visiting a fan node...
+        Dup { lab } => match next.slot() {
+          // If we're visiting a port 0, then it is a pair.
+          0 => {
+            if let Some(dup_paths) = &mut self.dup_paths {
+              let stack = dup_paths.entry(*lab).or_default();
+              if let Some(slot) = stack.pop() {
+                // Since we had a paired Dup in the path to this Sup,
+                // we "decay" the superposition according to the original direction we came from the Dup.
+                let term = self.read_term(self.net.enter_port(Port(node, slot)));
+                self.dup_paths.as_mut().unwrap().get_mut(lab).unwrap().push(slot);
+                Some(term)
+              } else {
+                None
+              }
             } else {
               None
             }
-          } else {
-            None
+            .unwrap_or_else(|| {
+              // If no Dup with same label in the path, we can't resolve the Sup, so keep it as a term.
+              self.decay_or_get_ports(node).map_or_else(
+                |(fst, snd)| Term::Sup {
+                  tag: self.labels.dup.to_tag(Some(*lab)),
+                  fst: Box::new(fst),
+                  snd: Box::new(snd),
+                },
+                |term| term,
+              )
+            })
           }
-          .unwrap_or_else(|| {
-            // If no Dup with same label in the path, we can't resolve the Sup, so keep it as a term.
-            self.decay_or_get_ports(node).map_or_else(
-              |(fst, snd)| Term::Sup {
-                tag: self.labels.dup.to_tag(Some(*lab)),
-                fst: Box::new(fst),
-                snd: Box::new(snd),
-              },
-              |term| term,
-            )
-          })
+          // If we're visiting a port 1 or 2, then it is a variable.
+          // Also, that means we found a dup, so we store it to read later.
+          1 | 2 => {
+            if let Some(dup_paths) = &mut self.dup_paths {
+              dup_paths.entry(*lab).or_default().push(next.slot());
+              let term = self.read_term(self.net.enter_port(Port(node, 0)));
+              self.dup_paths.as_mut().unwrap().entry(*lab).or_default().pop().unwrap();
+              term
+            } else {
+              if self.seen_fans.insert(node) {
+                self.scope.insert(node);
+              }
+              Term::Var { nam: self.namegen.var_name(next) }
+            }
+          }
+          _ => unreachable!(),
+        },
+        Num { val } => Term::Num { val: *val },
+        Op2 { opr } => match next.slot() {
+          2 => {
+            let fst = self.read_term(self.net.enter_port(Port(node, 0)));
+            let snd = self.read_term(self.net.enter_port(Port(node, 1)));
+
+            Term::Opx { op: Op::from_hvmc_label(*opr), fst: Box::new(fst), snd: Box::new(snd) }
+          }
+          _ => {
+            self.error(ReadbackError::InvalidNumericOp);
+            Term::Err
+          }
+        },
+        Rot => {
+          self.error(ReadbackError::ReachedRoot);
+          Term::Err
         }
-        // If we're visiting a port 1 or 2, then it is a variable.
-        // Also, that means we found a dup, so we store it to read later.
-        1 | 2 => {
-          if let Some(dup_paths) = &mut self.dup_paths {
-            dup_paths.entry(*lab).or_default().push(next.slot());
-            let term = self.read_term(self.net.enter_port(Port(node, 0)));
-            self.dup_paths.as_mut().unwrap().entry(*lab).or_default().pop().unwrap();
-            term
-          } else {
+        Tup => match next.slot() {
+          // If we're visiting a port 0, then it is a Tup.
+          0 => self
+            .decay_or_get_ports(node)
+            .map_or_else(|(fst, snd)| Term::Tup { fst: Box::new(fst), snd: Box::new(snd) }, |term| term),
+          // If we're visiting a port 1 or 2, then it is a variable.
+          1 | 2 => {
             if self.seen_fans.insert(node) {
               self.scope.insert(node);
             }
             Term::Var { nam: self.namegen.var_name(next) }
           }
-        }
-        _ => unreachable!(),
-      },
-      Num { val } => Term::Num { val: *val },
-      Op2 { opr } => match next.slot() {
-        2 => {
-          let fst = self.read_term(self.net.enter_port(Port(node, 0)));
-          let snd = self.read_term(self.net.enter_port(Port(node, 1)));
+          _ => unreachable!(),
+        },
+      };
 
-          Term::Opx { op: Op::from_hvmc_label(*opr), fst: Box::new(fst), snd: Box::new(snd) }
-        }
-        _ => {
-          self.error(ReadbackError::InvalidNumericOp);
-          Term::Err
-        }
-      },
-      Rot => {
-        self.error(ReadbackError::ReachedRoot);
-        Term::Err
-      }
-      Tup => match next.slot() {
-        // If we're visiting a port 0, then it is a Tup.
-        0 => self
-          .decay_or_get_ports(node)
-          .map_or_else(|(fst, snd)| Term::Tup { fst: Box::new(fst), snd: Box::new(snd) }, |term| term),
-        // If we're visiting a port 1 or 2, then it is a variable.
-        1 | 2 => {
-          if self.seen_fans.insert(node) {
-            self.scope.insert(node);
-          }
-          Term::Var { nam: self.namegen.var_name(next) }
-        }
-        _ => unreachable!(),
-      },
-    };
-
-    term
+      term
+    })
   }
 
   /// Enters both ports 1 and 2 of a node,
diff --git a/src/term/term_to_net.rs b/src/term/term_to_net.rs
index cac2bf3a..9eebc4d5 100644
--- a/src/term/term_to_net.rs
+++ b/src/term/term_to_net.rs
@@ -64,189 +64,191 @@ impl<'a> EncodeTermState<'a> {
   /// `global_vars` has the same information for global lambdas. Must be linked outside this function.
   /// Expects variables to be affine, refs to be stored as Refs and all names to be bound.
   fn encode_term(&mut self, term: &Term, up: Port) -> Option<Port> {
-    match term {
-      // A lambda becomes to a con node. Ports:
-      // - 0: points to where the lambda occurs.
-      // - 1: points to the lambda variable.
-      // - 2: points to the lambda body.
-      // core: (var_use bod)
-      Term::Lam { tag, nam, bod } => {
-        let fun = self.inet.new_node(Con { lab: self.labels.con.generate(tag) });
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match term {
+        // A lambda becomes to a con node. Ports:
+        // - 0: points to where the lambda occurs.
+        // - 1: points to the lambda variable.
+        // - 2: points to the lambda body.
+        // core: (var_use bod)
+        Term::Lam { tag, nam, bod } => {
+          let fun = self.inet.new_node(Con { lab: self.labels.con.generate(tag) });
 
-        self.push_scope(nam, Port(fun, 1));
-        let bod = self.encode_term(bod, Port(fun, 2));
-        self.pop_scope(nam, Port(fun, 1));
-        self.link_local(Port(fun, 2), bod);
+          self.push_scope(nam, Port(fun, 1));
+          let bod = self.encode_term(bod, Port(fun, 2));
+          self.pop_scope(nam, Port(fun, 1));
+          self.link_local(Port(fun, 2), bod);
 
-        Some(Port(fun, 0))
+          Some(Port(fun, 0))
+        }
+        // core: (var_use bod)
+        Term::Chn { tag, nam, bod } => {
+          let fun = self.inet.new_node(Con { lab: self.labels.con.generate(tag) });
+          self.global_vars.entry(nam.clone()).or_default().0 = Port(fun, 1);
+          let bod = self.encode_term(bod, Port(fun, 2));
+          self.link_local(Port(fun, 2), bod);
+          Some(Port(fun, 0))
+        }
+        // An application becomes to a con node too. Ports:
+        // - 0: points to the function being applied.
+        // - 1: points to the function's argument.
+        // - 2: points to where the application occurs.
+        // core: & fun ~ (arg ret) (fun not necessarily main port)
+        Term::App { tag, fun, arg } => {
+          let app = self.inet.new_node(Con { lab: self.labels.con.generate(tag) });
+
+          let fun = self.encode_term(fun, Port(app, 0));
+          self.link_local(Port(app, 0), fun);
+
+          let arg = self.encode_term(arg, Port(app, 1));
+          self.link_local(Port(app, 1), arg);
+
+          Some(Port(app, 2))
+        }
+        // core: & cond ~  (zero succ) ret
+        Term::Mat { args, rules } => {
+          // At this point should be only simple num matches.
+          let arg = args.iter().next().unwrap();
+          debug_assert!(matches!(rules[0].pats[..], [Pattern::Num(NumCtr::Num(0))]));
+          debug_assert!(matches!(rules[1].pats[..], [Pattern::Num(NumCtr::Succ(1, None))]));
+
+          let if_ = self.inet.new_node(Mat);
+
+          let cond = self.encode_term(arg, Port(if_, 0));
+          self.link_local(Port(if_, 0), cond);
+
+          let zero = &rules[0].body;
+          let succ = &rules[1].body;
+
+          let sel = self.inet.new_node(Con { lab: None });
+          self.inet.link(Port(sel, 0), Port(if_, 1));
+          let zero = self.encode_term(zero, Port(sel, 1));
+          self.link_local(Port(sel, 1), zero);
+
+          let succ = self.encode_term(succ, Port(sel, 2));
+          self.link_local(Port(sel, 2), succ);
+
+          Some(Port(if_, 2))
+        }
+        // A dup becomes a dup node too. Ports:
+        // - 0: points to the value projected.
+        // - 1: points to the occurrence of the first variable.
+        // - 2: points to the occurrence of the second variable.
+        // core: & val ~ {lab fst snd} (val not necessarily main port)
+        Term::Dup { fst, snd, val, nxt, tag } => {
+          let dup = self.inet.new_node(Dup { lab: self.labels.dup.generate(tag).unwrap() });
+
+          let val = self.encode_term(val, Port(dup, 0));
+          self.link_local(Port(dup, 0), val);
+
+          self.push_scope(fst, Port(dup, 1));
+          self.push_scope(snd, Port(dup, 2));
+          let nxt = self.encode_term(nxt, up);
+          self.pop_scope(snd, Port(dup, 2));
+          self.pop_scope(fst, Port(dup, 1));
+
+          nxt
+        }
+        Term::Var { nam } => {
+          // We assume this variable to be valid, bound and correctly scoped.
+          // This pass must be done before.
+          debug_assert!(
+            self.scope.contains_key(nam),
+            "Unbound variable {nam}. Expected this check to be already done"
+          );
+          let var_stack = &self.scope[nam];
+          let cur_var = *var_stack.last().unwrap();
+          let (declare_port, use_port) = self.vars.get_mut(cur_var).unwrap();
+          debug_assert!(use_port.is_none(), "Variable {nam} used more than once");
+          self.inet.link(up, *declare_port);
+          *use_port = Some(up);
+          Some(*declare_port)
+        }
+        Term::Lnk { nam } => {
+          self.global_vars.entry(nam.clone()).or_default().1 = up;
+          None
+        }
+        // core: @def_id
+        Term::Ref { nam: def_name } => {
+          let node = self.inet.new_node(Ref { def_name: def_name.clone() });
+          self.inet.link(Port(node, 1), Port(node, 2));
+          self.inet.link(up, Port(node, 0));
+          Some(Port(node, 0))
+        }
+        Term::Let { pat: Pattern::Tup(box Pattern::Var(l_nam), box Pattern::Var(r_nam)), val, nxt } => {
+          let dup = self.inet.new_node(Tup);
+
+          let val = self.encode_term(val, Port(dup, 0));
+          self.link_local(Port(dup, 0), val);
+
+          self.push_scope(l_nam, Port(dup, 1));
+          self.push_scope(r_nam, Port(dup, 2));
+          let nxt = self.encode_term(nxt, up);
+          self.pop_scope(r_nam, Port(dup, 2));
+          self.pop_scope(l_nam, Port(dup, 1));
+
+          nxt
+        }
+        Term::Let { pat: Pattern::Var(None), val, nxt } => {
+          let nod = self.inet.new_node(Era);
+          let val = self.encode_term(val, Port(nod, 0));
+
+          self.link_local(Port(nod, 0), val);
+
+          self.encode_term(nxt, up)
+        }
+        Term::Let { .. } => unreachable!(), // Removed in earlier pass
+        Term::Sup { tag, fst, snd } => {
+          let sup = self.inet.new_node(Dup { lab: self.labels.dup.generate(tag).unwrap() });
+
+          let fst = self.encode_term(fst, Port(sup, 1));
+          self.link_local(Port(sup, 1), fst);
+
+          let snd = self.encode_term(snd, Port(sup, 2));
+          self.link_local(Port(sup, 2), snd);
+
+          Some(Port(sup, 0))
+        }
+        Term::Era => {
+          let era = self.inet.new_node(Era);
+          self.inet.link(Port(era, 1), Port(era, 2));
+          Some(Port(era, 0))
+        }
+        // core: #val
+        Term::Num { val } => {
+          let node = self.inet.new_node(Num { val: *val });
+          // This representation only has nodes of arity 2, so we connect the two aux ports that are not used.
+          self.inet.link(Port(node, 1), Port(node, 2));
+          Some(Port(node, 0))
+        }
+        Term::Str { .. } => unreachable!(), // Removed in desugar str
+        Term::Lst { .. } => unreachable!(), // Removed in desugar list
+        // core: & fst ~ <op snd ret>
+        Term::Opx { op, fst, snd } => {
+          let opx = self.inet.new_node(Op2 { opr: op.to_hvmc_label() });
+
+          let fst_port = self.encode_term(fst, Port(opx, 0));
+          self.link_local(Port(opx, 0), fst_port);
+
+          let snd_port = self.encode_term(snd, Port(opx, 1));
+          self.link_local(Port(opx, 1), snd_port);
+
+          Some(Port(opx, 2))
+        }
+        Term::Tup { fst, snd } => {
+          let tup = self.inet.new_node(Tup);
+
+          let fst = self.encode_term(fst, Port(tup, 1));
+          self.link_local(Port(tup, 1), fst);
+
+          let snd = self.encode_term(snd, Port(tup, 2));
+          self.link_local(Port(tup, 2), snd);
+
+          Some(Port(tup, 0))
+        }
+        Term::Err => unreachable!(),
       }
-      // core: (var_use bod)
-      Term::Chn { tag, nam, bod } => {
-        let fun = self.inet.new_node(Con { lab: self.labels.con.generate(tag) });
-        self.global_vars.entry(nam.clone()).or_default().0 = Port(fun, 1);
-        let bod = self.encode_term(bod, Port(fun, 2));
-        self.link_local(Port(fun, 2), bod);
-        Some(Port(fun, 0))
-      }
-      // An application becomes to a con node too. Ports:
-      // - 0: points to the function being applied.
-      // - 1: points to the function's argument.
-      // - 2: points to where the application occurs.
-      // core: & fun ~ (arg ret) (fun not necessarily main port)
-      Term::App { tag, fun, arg } => {
-        let app = self.inet.new_node(Con { lab: self.labels.con.generate(tag) });
-
-        let fun = self.encode_term(fun, Port(app, 0));
-        self.link_local(Port(app, 0), fun);
-
-        let arg = self.encode_term(arg, Port(app, 1));
-        self.link_local(Port(app, 1), arg);
-
-        Some(Port(app, 2))
-      }
-      // core: & cond ~  (zero succ) ret
-      Term::Mat { args, rules } => {
-        // At this point should be only simple num matches.
-        let arg = args.iter().next().unwrap();
-        debug_assert!(matches!(rules[0].pats[..], [Pattern::Num(NumCtr::Num(0))]));
-        debug_assert!(matches!(rules[1].pats[..], [Pattern::Num(NumCtr::Succ(1, None))]));
-
-        let if_ = self.inet.new_node(Mat);
-
-        let cond = self.encode_term(arg, Port(if_, 0));
-        self.link_local(Port(if_, 0), cond);
-
-        let zero = &rules[0].body;
-        let succ = &rules[1].body;
-
-        let sel = self.inet.new_node(Con { lab: None });
-        self.inet.link(Port(sel, 0), Port(if_, 1));
-        let zero = self.encode_term(zero, Port(sel, 1));
-        self.link_local(Port(sel, 1), zero);
-
-        let succ = self.encode_term(succ, Port(sel, 2));
-        self.link_local(Port(sel, 2), succ);
-
-        Some(Port(if_, 2))
-      }
-      // A dup becomes a dup node too. Ports:
-      // - 0: points to the value projected.
-      // - 1: points to the occurrence of the first variable.
-      // - 2: points to the occurrence of the second variable.
-      // core: & val ~ {lab fst snd} (val not necessarily main port)
-      Term::Dup { fst, snd, val, nxt, tag } => {
-        let dup = self.inet.new_node(Dup { lab: self.labels.dup.generate(tag).unwrap() });
-
-        let val = self.encode_term(val, Port(dup, 0));
-        self.link_local(Port(dup, 0), val);
-
-        self.push_scope(fst, Port(dup, 1));
-        self.push_scope(snd, Port(dup, 2));
-        let nxt = self.encode_term(nxt, up);
-        self.pop_scope(snd, Port(dup, 2));
-        self.pop_scope(fst, Port(dup, 1));
-
-        nxt
-      }
-      Term::Var { nam } => {
-        // We assume this variable to be valid, bound and correctly scoped.
-        // This pass must be done before.
-        debug_assert!(
-          self.scope.contains_key(nam),
-          "Unbound variable {nam}. Expected this check to be already done"
-        );
-        let var_stack = &self.scope[nam];
-        let cur_var = *var_stack.last().unwrap();
-        let (declare_port, use_port) = self.vars.get_mut(cur_var).unwrap();
-        debug_assert!(use_port.is_none(), "Variable {nam} used more than once");
-        self.inet.link(up, *declare_port);
-        *use_port = Some(up);
-        Some(*declare_port)
-      }
-      Term::Lnk { nam } => {
-        self.global_vars.entry(nam.clone()).or_default().1 = up;
-        None
-      }
-      // core: @def_id
-      Term::Ref { nam: def_name } => {
-        let node = self.inet.new_node(Ref { def_name: def_name.clone() });
-        self.inet.link(Port(node, 1), Port(node, 2));
-        self.inet.link(up, Port(node, 0));
-        Some(Port(node, 0))
-      }
-      Term::Let { pat: Pattern::Tup(box Pattern::Var(l_nam), box Pattern::Var(r_nam)), val, nxt } => {
-        let dup = self.inet.new_node(Tup);
-
-        let val = self.encode_term(val, Port(dup, 0));
-        self.link_local(Port(dup, 0), val);
-
-        self.push_scope(l_nam, Port(dup, 1));
-        self.push_scope(r_nam, Port(dup, 2));
-        let nxt = self.encode_term(nxt, up);
-        self.pop_scope(r_nam, Port(dup, 2));
-        self.pop_scope(l_nam, Port(dup, 1));
-
-        nxt
-      }
-      Term::Let { pat: Pattern::Var(None), val, nxt } => {
-        let nod = self.inet.new_node(Era);
-        let val = self.encode_term(val, Port(nod, 0));
-
-        self.link_local(Port(nod, 0), val);
-
-        self.encode_term(nxt, up)
-      }
-      Term::Let { .. } => unreachable!(), // Removed in earlier pass
-      Term::Sup { tag, fst, snd } => {
-        let sup = self.inet.new_node(Dup { lab: self.labels.dup.generate(tag).unwrap() });
-
-        let fst = self.encode_term(fst, Port(sup, 1));
-        self.link_local(Port(sup, 1), fst);
-
-        let snd = self.encode_term(snd, Port(sup, 2));
-        self.link_local(Port(sup, 2), snd);
-
-        Some(Port(sup, 0))
-      }
-      Term::Era => {
-        let era = self.inet.new_node(Era);
-        self.inet.link(Port(era, 1), Port(era, 2));
-        Some(Port(era, 0))
-      }
-      // core: #val
-      Term::Num { val } => {
-        let node = self.inet.new_node(Num { val: *val });
-        // This representation only has nodes of arity 2, so we connect the two aux ports that are not used.
-        self.inet.link(Port(node, 1), Port(node, 2));
-        Some(Port(node, 0))
-      }
-      Term::Str { .. } => unreachable!(), // Removed in desugar str
-      Term::Lst { .. } => unreachable!(), // Removed in desugar list
-      // core: & fst ~ <op snd ret>
-      Term::Opx { op, fst, snd } => {
-        let opx = self.inet.new_node(Op2 { opr: op.to_hvmc_label() });
-
-        let fst_port = self.encode_term(fst, Port(opx, 0));
-        self.link_local(Port(opx, 0), fst_port);
-
-        let snd_port = self.encode_term(snd, Port(opx, 1));
-        self.link_local(Port(opx, 1), snd_port);
-
-        Some(Port(opx, 2))
-      }
-      Term::Tup { fst, snd } => {
-        let tup = self.inet.new_node(Tup);
-
-        let fst = self.encode_term(fst, Port(tup, 1));
-        self.link_local(Port(tup, 1), fst);
-
-        let snd = self.encode_term(snd, Port(tup, 2));
-        self.link_local(Port(tup, 2), snd);
-
-        Some(Port(tup, 0))
-      }
-      Term::Err => unreachable!(),
-    }
+    })
   }
 
   fn push_scope(&mut self, name: &Option<Name>, decl_port: Port) {
diff --git a/src/term/transform/desugar_let_destructors.rs b/src/term/transform/desugar_let_destructors.rs
index 59349734..1f5323f5 100644
--- a/src/term/transform/desugar_let_destructors.rs
+++ b/src/term/transform/desugar_let_destructors.rs
@@ -43,7 +43,10 @@ impl Term {
       | Term::Err => (),
 
       Term::Let { .. } => {
-        let Term::Let { pat, mut val, mut nxt } = std::mem::take(self) else { unreachable!() };
+        let Term::Let { pat, val, nxt } = self else { unreachable!() };
+        let pat = pat.clone();
+        let mut val = std::mem::take(val);
+        let mut nxt = std::mem::take(nxt);
 
         val.desugar_let_destructors();
         nxt.desugar_let_destructors();
diff --git a/src/term/transform/linearize_matches.rs b/src/term/transform/linearize_matches.rs
index 2f365033..f57e29d9 100644
--- a/src/term/transform/linearize_matches.rs
+++ b/src/term/transform/linearize_matches.rs
@@ -24,44 +24,46 @@ impl Ctx<'_> {
 
 impl Term {
   fn linearize_simple_matches(&mut self, lift_all_vars: bool) -> Result<(), MatchErr> {
-    match self {
-      Term::Mat { args: _, rules } => {
-        for rule in rules.iter_mut() {
-          rule.body.linearize_simple_matches(lift_all_vars).unwrap();
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match self {
+        Term::Mat { args: _, rules } => {
+          for rule in rules.iter_mut() {
+            rule.body.linearize_simple_matches(lift_all_vars).unwrap();
+          }
+          lift_match_vars(self, lift_all_vars);
         }
-        lift_match_vars(self, lift_all_vars);
-      }
 
-      Term::Lam { bod, .. } | Term::Chn { bod, .. } => {
-        bod.linearize_simple_matches(lift_all_vars)?;
-      }
+        Term::Lam { bod, .. } | Term::Chn { bod, .. } => {
+          bod.linearize_simple_matches(lift_all_vars)?;
+        }
 
-      Term::Let { pat: Pattern::Var(..), val: fst, nxt: snd }
-      | Term::Tup { fst, snd }
-      | Term::Dup { val: fst, nxt: snd, .. }
-      | Term::Sup { fst, snd, .. }
-      | Term::Opx { fst, snd, .. }
-      | Term::App { fun: fst, arg: snd, .. } => {
-        fst.linearize_simple_matches(lift_all_vars)?;
-        snd.linearize_simple_matches(lift_all_vars)?;
-      }
+        Term::Let { pat: Pattern::Var(..), val: fst, nxt: snd }
+        | Term::Tup { fst, snd }
+        | Term::Dup { val: fst, nxt: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Opx { fst, snd, .. }
+        | Term::App { fun: fst, arg: snd, .. } => {
+          fst.linearize_simple_matches(lift_all_vars)?;
+          snd.linearize_simple_matches(lift_all_vars)?;
+        }
 
-      Term::Lst { .. } => unreachable!(),
-      Term::Let { pat, .. } => {
-        unreachable!("Destructor let expression should have been desugared already. {pat}")
-      }
+        Term::Lst { .. } => unreachable!(),
+        Term::Let { pat, .. } => {
+          unreachable!("Destructor let expression should have been desugared already. {pat}")
+        }
 
-      Term::Str { .. }
-      | Term::Lnk { .. }
-      | Term::Var { .. }
-      | Term::Num { .. }
-      | Term::Ref { .. }
-      | Term::Era => {}
+        Term::Str { .. }
+        | Term::Lnk { .. }
+        | Term::Var { .. }
+        | Term::Num { .. }
+        | Term::Ref { .. }
+        | Term::Era => {}
 
-      Term::Err => todo!(),
-    };
+        Term::Err => todo!(),
+      };
 
-    Ok(())
+      Ok(())
+    })
   }
 }
 
diff --git a/src/term/transform/linearize_vars.rs b/src/term/transform/linearize_vars.rs
index 02f90f65..ad7591c0 100644
--- a/src/term/transform/linearize_vars.rs
+++ b/src/term/transform/linearize_vars.rs
@@ -62,7 +62,10 @@ fn term_to_affine(term: &mut Term, inst_count: &mut HashMap<Name, u64>) {
           if val.has_unscoped() {
             term_to_affine(val, inst_count);
 
-            let Term::Let { val, nxt, .. } = std::mem::take(term) else { unreachable!() };
+            let Term::Let { val, nxt, .. } = term else { unreachable!() };
+            let val = std::mem::take(val);
+            let nxt = std::mem::take(nxt);
+
             *term = Term::Let { pat: Pattern::Var(None), val, nxt };
 
             return;
@@ -86,7 +89,8 @@ fn term_to_affine(term: &mut Term, inst_count: &mut HashMap<Name, u64>) {
       if val.has_unscoped() {
         term_to_affine(val, inst_count);
       } else {
-        let Term::Let { nxt, .. } = std::mem::take(term) else { unreachable!() };
+        let Term::Let { nxt, .. } = term else { unreachable!() };
+        let nxt = std::mem::take(nxt);
         *term = *nxt;
       }
     }
diff --git a/src/term/transform/resolve_refs.rs b/src/term/transform/resolve_refs.rs
index e955e095..fa4f8336 100644
--- a/src/term/transform/resolve_refs.rs
+++ b/src/term/transform/resolve_refs.rs
@@ -49,82 +49,86 @@ impl Term {
     main: Option<&Name>,
     scope: &mut HashMap<&'a Name, usize>,
   ) -> Result<(), ReferencedMainErr> {
-    match self {
-      Term::Lam { nam, bod, .. } => {
-        push_scope(nam.as_ref(), scope);
-        bod.resolve_refs(def_names, main, scope)?;
-        pop_scope(nam.as_ref(), scope);
-      }
-      Term::Let { pat: Pattern::Var(nam), val, nxt } => {
-        val.resolve_refs(def_names, main, scope)?;
-        push_scope(nam.as_ref(), scope);
-        nxt.resolve_refs(def_names, main, scope)?;
-        pop_scope(nam.as_ref(), scope);
-      }
-      Term::Let { pat, val, nxt } => {
-        val.resolve_refs(def_names, main, scope)?;
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match self {
+        Term::Lam { nam, bod, .. } => {
+          push_scope(nam.as_ref(), scope);
+          bod.resolve_refs(def_names, main, scope)?;
+          pop_scope(nam.as_ref(), scope);
+        }
+        Term::Let { pat: Pattern::Var(nam), val, nxt } => {
+          val.resolve_refs(def_names, main, scope)?;
+          push_scope(nam.as_ref(), scope);
+          nxt.resolve_refs(def_names, main, scope)?;
+          pop_scope(nam.as_ref(), scope);
+        }
+        Term::Let { pat, val, nxt } => {
+          val.resolve_refs(def_names, main, scope)?;
 
-        for nam in pat.binds() {
-          push_scope(Some(nam), scope);
+          for nam in pat.binds() {
+            push_scope(Some(nam), scope);
+          }
+
+          nxt.resolve_refs(def_names, main, scope)?;
+
+          for nam in pat.binds() {
+            pop_scope(Some(nam), scope);
+          }
+        }
+        Term::Dup { tag: _, fst, snd, val, nxt } => {
+          val.resolve_refs(def_names, main, scope)?;
+          push_scope(fst.as_ref(), scope);
+          push_scope(snd.as_ref(), scope);
+          nxt.resolve_refs(def_names, main, scope)?;
+          pop_scope(fst.as_ref(), scope);
+          pop_scope(snd.as_ref(), scope);
         }
 
-        nxt.resolve_refs(def_names, main, scope)?;
+        // If variable not defined, we check if it's a ref and swap if it is.
+        Term::Var { nam } => {
+          if is_var_in_scope(nam, scope) {
+            if let Some(main) = main {
+              if nam == main {
+                return Err(ReferencedMainErr);
+              }
+            }
 
-        for nam in pat.binds() {
-          pop_scope(Some(nam), scope);
-        }
-      }
-      Term::Dup { tag: _, fst, snd, val, nxt } => {
-        val.resolve_refs(def_names, main, scope)?;
-        push_scope(fst.as_ref(), scope);
-        push_scope(snd.as_ref(), scope);
-        nxt.resolve_refs(def_names, main, scope)?;
-        pop_scope(fst.as_ref(), scope);
-        pop_scope(snd.as_ref(), scope);
-      }
-
-      // If variable not defined, we check if it's a ref and swap if it is.
-      Term::Var { nam } => {
-        if is_var_in_scope(nam, scope) {
-          if let Some(main) = main {
-            if nam == main {
-              return Err(ReferencedMainErr);
+            if def_names.contains(nam) || CORE_BUILTINS.contains(&nam.0.as_ref()) {
+              *self = Term::r#ref(nam);
             }
           }
+        }
+        Term::Chn { bod, .. } => bod.resolve_refs(def_names, main, scope)?,
+        Term::App { fun: fst, arg: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Tup { fst, snd }
+        | Term::Opx { fst, snd, .. } => {
+          fst.resolve_refs(def_names, main, scope)?;
+          snd.resolve_refs(def_names, main, scope)?;
+        }
+        Term::Mat { args, rules } => {
+          for arg in args {
+            arg.resolve_refs(def_names, main, scope)?;
+          }
+          for rule in rules {
+            for nam in rule.pats.iter().flat_map(|p| p.bind_or_eras()) {
+              push_scope(nam.as_ref(), scope);
+            }
 
-          if def_names.contains(nam) || CORE_BUILTINS.contains(&nam.0.as_ref()) {
-            *self = Term::r#ref(nam);
+            rule.body.resolve_refs(def_names, main, scope)?;
+
+            for nam in rule.pats.iter().flat_map(|p| p.bind_or_eras()).rev() {
+              pop_scope(nam.as_ref(), scope);
+            }
           }
         }
-      }
-      Term::Chn { bod, .. } => bod.resolve_refs(def_names, main, scope)?,
-      Term::App { fun: fst, arg: snd, .. }
-      | Term::Sup { fst, snd, .. }
-      | Term::Tup { fst, snd }
-      | Term::Opx { fst, snd, .. } => {
-        fst.resolve_refs(def_names, main, scope)?;
-        snd.resolve_refs(def_names, main, scope)?;
-      }
-      Term::Mat { args, rules } => {
-        for arg in args {
-          arg.resolve_refs(def_names, main, scope)?;
-        }
-        for rule in rules {
-          for nam in rule.pats.iter().flat_map(|p| p.bind_or_eras()) {
-            push_scope(nam.as_ref(), scope);
-          }
-
-          rule.body.resolve_refs(def_names, main, scope)?;
-
-          for nam in rule.pats.iter().flat_map(|p| p.bind_or_eras()).rev() {
-            pop_scope(nam.as_ref(), scope);
-          }
+        Term::Lst { .. } => unreachable!("Should have been desugared already"),
+        Term::Lnk { .. } | Term::Ref { .. } | Term::Num { .. } | Term::Str { .. } | Term::Era | Term::Err => {
+          ()
         }
       }
-      Term::Lst { .. } => unreachable!("Should have been desugared already"),
-      Term::Lnk { .. } | Term::Ref { .. } | Term::Num { .. } | Term::Str { .. } | Term::Era | Term::Err => (),
-    }
-    Ok(())
+      Ok(())
+    })
   }
 }
 
diff --git a/src/term/transform/resugar_builtins.rs b/src/term/transform/resugar_builtins.rs
index 0fbbab5d..3925768f 100644
--- a/src/term/transform/resugar_builtins.rs
+++ b/src/term/transform/resugar_builtins.rs
@@ -17,15 +17,13 @@ impl Term {
       } => {
         head.resugar_strings();
         tail.resugar_strings();
-        let head = std::mem::take(head);
-        let mut tail = std::mem::take(tail);
 
         if ctr == SCONS
           && let Term::Num { val } = head
           && let Term::Str { val: tail } = tail
         {
           // If well formed string, add the next character to the string we're building
-          let head = unsafe { char::from_u32_unchecked(val as u32) }.to_string();
+          let head = unsafe { char::from_u32_unchecked(*val as u32) }.to_string();
           let str = head + &tail;
           *self = Term::str(&str);
         } else {
@@ -33,8 +31,12 @@ impl Term {
 
           // Create `(Cons head Nil)` instead of `(Cons head "")`
           if matches!(&tail, Term::Str { val } if val.is_empty()) {
-            tail = Term::r#ref(SNIL);
+            *tail = Term::r#ref(SNIL);
           }
+
+          let head = std::mem::take(head);
+          let tail = std::mem::take(tail);
+
           *self = Term::call(Term::Ref { nam: ctr.clone() }, [head, tail]);
         }
       }
@@ -88,16 +90,16 @@ impl Term {
         head.resugar_lists();
         tail.resugar_lists();
         let head = std::mem::take(head);
-        let tail = std::mem::take(tail);
 
         if ctr == LCONS
           && let Term::Lst { els: tail } = tail
         {
           // If well formed list, cons the next element to the list being formed
           let mut els = vec![head];
-          els.extend(tail);
+          els.extend(std::mem::take(tail));
           *self = Term::Lst { els };
         } else {
+          let tail = std::mem::take(tail);
           *self = Term::call(Term::Ref { nam: ctr.clone() }, [head, tail]);
         }
       }
diff --git a/src/term/transform/simplify_matches.rs b/src/term/transform/simplify_matches.rs
index c15f880f..230bdb2c 100644
--- a/src/term/transform/simplify_matches.rs
+++ b/src/term/transform/simplify_matches.rs
@@ -39,38 +39,40 @@ impl Term {
   ///
   /// See `[simplify_match_expression]` for more information.
   pub fn simplify_matches(&mut self, ctrs: &Constructors, adts: &Adts) -> Result<(), MatchErr> {
-    match self {
-      Term::Mat { args, rules } => {
-        let (new_args, extracted) = extract_args(args);
+    stacker::maybe_grow(1024 * 32, 1024 * 1024, move || {
+      match self {
+        Term::Mat { args, rules } => {
+          let (new_args, extracted) = extract_args(args);
 
-        *self = simplify_match_expression(&new_args, rules, ctrs, adts)?;
-        *self = bind_extracted_args(extracted, std::mem::take(self));
-      }
-
-      Term::Lst { els } => {
-        for el in els {
-          el.simplify_matches(ctrs, adts)?;
+          let term = simplify_match_expression(&new_args, rules, ctrs, adts)?;
+          *self = bind_extracted_args(extracted, term);
         }
+
+        Term::Lst { els } => {
+          for el in els {
+            el.simplify_matches(ctrs, adts)?;
+          }
+        }
+        Term::Let { val: fst, nxt: snd, .. }
+        | Term::App { fun: fst, arg: snd, .. }
+        | Term::Tup { fst, snd }
+        | Term::Dup { val: fst, nxt: snd, .. }
+        | Term::Sup { fst, snd, .. }
+        | Term::Opx { fst, snd, .. } => {
+          fst.simplify_matches(ctrs, adts)?;
+          snd.simplify_matches(ctrs, adts)?;
+        }
+        Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.simplify_matches(ctrs, adts)?,
+        Term::Var { .. }
+        | Term::Lnk { .. }
+        | Term::Num { .. }
+        | Term::Str { .. }
+        | Term::Ref { .. }
+        | Term::Era => (),
+        Term::Err => unreachable!(),
       }
-      Term::Let { val: fst, nxt: snd, .. }
-      | Term::App { fun: fst, arg: snd, .. }
-      | Term::Tup { fst, snd }
-      | Term::Dup { val: fst, nxt: snd, .. }
-      | Term::Sup { fst, snd, .. }
-      | Term::Opx { fst, snd, .. } => {
-        fst.simplify_matches(ctrs, adts)?;
-        snd.simplify_matches(ctrs, adts)?;
-      }
-      Term::Lam { bod, .. } | Term::Chn { bod, .. } => bod.simplify_matches(ctrs, adts)?,
-      Term::Var { .. }
-      | Term::Lnk { .. }
-      | Term::Num { .. }
-      | Term::Str { .. }
-      | Term::Ref { .. }
-      | Term::Era => (),
-      Term::Err => unreachable!(),
-    }
-    Ok(())
+      Ok(())
+    })
   }
 }