fix dependencies

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "ab_glyph"
 version = "0.2.11"
@@ -3356,6 +3358,7 @@ dependencies = [
  "roc_types",
  "roc_unify",
  "ven_ena",
+ "ven_graph",
  "ven_pretty",
 ]
 

compiler/mono/Cargo.toml

@@ -19,6 +19,7 @@ morphic_lib = { path = "../../vendor/morphic_lib" }
 bumpalo = { version = "3.6.1", features = ["collections"] }
 hashbrown = { version = "0.11.2", features = [ "bumpalo" ] }
 ven_ena = { path = "../../vendor/ena" }
+ven_graph = { path = "../../vendor/pathfinding" }
 linked-hash-map = "0.5.4"
 
 [dev-dependencies]

compiler/mono/src/ir.rs

@@ -848,13 +848,21 @@ impl<'a, 'i> Env<'a, 'i> {
 #[derive(Clone, Debug, PartialEq, Copy, Eq, Hash)]
 pub struct JoinPointId(pub Symbol);
 
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub struct Param<'a> {
     pub symbol: Symbol,
     pub borrow: bool,
     pub layout: Layout<'a>,
 }
 
+impl<'a> Param<'a> {
+    pub const EMPTY: Self = Param {
+        symbol: Symbol::EMPTY_PARAM,
+        borrow: false,
+        layout: Layout::Struct(&[]),
+    };
+}
+
 pub fn cond<'a>(
     env: &mut Env<'a, '_>,
     cond_symbol: Symbol,