Merge pull request #3480 from rtfeldman/types-dead-code

Get rid of more dead code due to builtins

Cargo.lock

@@ -3339,6 +3339,7 @@ dependencies = [
  "roc_problem",
  "roc_region",
  "roc_reporting",
+ "roc_solve",
  "roc_target",
  "roc_types",
  "roc_unify",

crates/ast/Cargo.toml

@@ -16,6 +16,7 @@ roc_parse = { path = "../compiler/parse" }
 roc_problem = { path = "../compiler/problem" }
 roc_types = { path = "../compiler/types" }
 roc_unify = { path = "../compiler/unify"}
+roc_solve = { path = "../compiler/solve"}
 roc_load = { path = "../compiler/load" }
 roc_target = { path = "../compiler/roc_target" }
 roc_error_macros = { path = "../error_macros" }

crates/ast/src/builtin_aliases.rs

@@ -1,12 +1,88 @@
-use crate::solved_types::{BuiltinAlias, SolvedType};
-use crate::subs::VarId;
-use crate::types::{AliasKind, RecordField};
-use roc_collections::all::{default_hasher, MutMap};
-use roc_module::ident::TagName;
+use roc_collections::all::{default_hasher, ImMap, MutMap};
+use roc_module::ident::{Lowercase, TagName};
 use roc_module::symbol::Symbol;
 use roc_region::all::{Loc, Region};
+use roc_types::subs::{VarId, Variable};
+use roc_types::types::{AliasKind, Problem, RecordField};
 use std::collections::HashMap;
 
+#[derive(Debug, Clone)]
+pub struct SolvedLambdaSet(pub SolvedType);
+
+/// This is a fully solved type, with no Variables remaining in it.
+#[derive(Debug, Clone)]
+pub enum SolvedType {
+    /// A function. The types of its arguments, then the type of its return value.
+    #[allow(unused)]
+    Func(Vec<SolvedType>, Box<SolvedType>, Box<SolvedType>),
+    /// Applying a type to some arguments (e.g. Map.Map String Int)
+    #[allow(unused)]
+    Apply(Symbol, Vec<SolvedType>),
+    /// A bound type variable, e.g. `a` in `(a -> a)`
+    #[allow(unused)]
+    Rigid(Lowercase),
+    Flex(VarId),
+    #[allow(unused)]
+    Wildcard,
+    /// Inline type alias, e.g. `as List a` in `[Cons a (List a), Nil] as List a`
+    #[allow(unused)]
+    Record {
+        fields: Vec<(Lowercase, RecordField<SolvedType>)>,
+        /// The row type variable in an open record, e.g. the `r` in `{ name: Str }r`.
+        /// This is None if it's a closed record annotation like `{ name: Str }`.
+        ext: Box<SolvedType>,
+    },
+    #[allow(unused)]
+    EmptyRecord,
+    TagUnion(Vec<(TagName, Vec<SolvedType>)>, Box<SolvedType>),
+    #[allow(unused)]
+    LambdaTag(Symbol, Vec<SolvedType>),
+    #[allow(unused)]
+    FunctionOrTagUnion(TagName, Symbol, Box<SolvedType>),
+    #[allow(unused)]
+    RecursiveTagUnion(VarId, Vec<(TagName, Vec<SolvedType>)>, Box<SolvedType>),
+    EmptyTagUnion,
+    /// A type from an Invalid module
+    #[allow(unused)]
+    Erroneous(Problem),
+
+    Alias(
+        Symbol,
+        Vec<SolvedType>,
+        Vec<SolvedLambdaSet>,
+        Box<SolvedType>,
+        AliasKind,
+    ),
+
+    #[allow(unused)]
+    HostExposedAlias {
+        name: Symbol,
+        arguments: Vec<SolvedType>,
+        lambda_set_variables: Vec<SolvedLambdaSet>,
+        actual_var: VarId,
+        actual: Box<SolvedType>,
+    },
+
+    /// A type error
+    #[allow(unused)]
+    Error,
+}
+
+#[derive(Clone, Debug)]
+pub struct BuiltinAlias {
+    pub region: Region,
+    pub vars: Vec<Loc<Lowercase>>,
+    pub typ: SolvedType,
+    pub kind: AliasKind,
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct FreeVars {
+    pub named_vars: ImMap<Lowercase, Variable>,
+    pub unnamed_vars: ImMap<VarId, Variable>,
+    pub wildcards: Vec<Variable>,
+}
+
 const NUM_BUILTIN_IMPORTS: usize = 8;
 
 /// These can be shared between definitions, they will get instantiated when converted to Type
@@ -411,235 +487,66 @@ fn floatingpoint_alias_content(range: SolvedType) -> SolvedType {
     range
 }
 
-// FRAC
-
-#[inline(always)]
-pub fn frac_type(range: SolvedType) -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_FRAC,
-        vec![(range.clone())],
-        vec![],
-        Box::new(frac_alias_content(range)),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn frac_alias_content(range: SolvedType) -> SolvedType {
     num_type(floatingpoint_type(range))
 }
 
-// F64
-
-#[inline(always)]
-pub fn f64_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_F64,
-        vec![],
-        vec![],
-        Box::new(f64_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn f64_alias_content() -> SolvedType {
     frac_alias_content(binary64_type())
 }
 
-// F32
-
-#[inline(always)]
-pub fn f32_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_F32,
-        vec![],
-        vec![],
-        Box::new(f32_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn f32_alias_content() -> SolvedType {
     frac_alias_content(binary32_type())
 }
 
-// Nat
-
-#[inline(always)]
-pub fn nat_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_NAT,
-        vec![],
-        vec![],
-        Box::new(nat_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn nat_alias_content() -> SolvedType {
     int_alias_content(natural_type())
 }
 
-// I128
-
-#[inline(always)]
-pub fn i128_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_I128,
-        vec![],
-        vec![],
-        Box::new(i128_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn i128_alias_content() -> SolvedType {
     int_alias_content(signed128_type())
 }
 
-// I128
-
-#[inline(always)]
-pub fn u128_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_U128,
-        vec![],
-        vec![],
-        Box::new(u128_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn u128_alias_content() -> SolvedType {
     int_alias_content(unsigned128_type())
 }
 
-// U64
-
-#[inline(always)]
-pub fn u64_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_U64,
-        vec![],
-        vec![],
-        Box::new(u64_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn u64_alias_content() -> SolvedType {
     int_alias_content(unsigned64_type())
 }
 
-// I64
-
-#[inline(always)]
-pub fn i64_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_I64,
-        vec![],
-        vec![],
-        Box::new(i64_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn i64_alias_content() -> SolvedType {
     int_alias_content(signed64_type())
 }
 
-// U32
-
-#[inline(always)]
-pub fn u32_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_U32,
-        vec![],
-        vec![],
-        Box::new(u32_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn u32_alias_content() -> SolvedType {
     int_alias_content(unsigned32_type())
 }
 
-// I32
-
-#[inline(always)]
-pub fn i32_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_I32,
-        vec![],
-        vec![],
-        Box::new(i32_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn i32_alias_content() -> SolvedType {
     int_alias_content(signed32_type())
 }
 
-// U16
-
-#[inline(always)]
-pub fn u16_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_U16,
-        vec![],
-        vec![],
-        Box::new(u16_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn u16_alias_content() -> SolvedType {
     int_alias_content(unsigned16_type())
 }
 
-// I16
-
-#[inline(always)]
-pub fn i16_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_I16,
-        vec![],
-        vec![],
-        Box::new(i16_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn i16_alias_content() -> SolvedType {
     int_alias_content(signed16_type())
 }
 
-// U8
-
-#[inline(always)]
-pub fn u8_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_U8,
-        vec![],
-        vec![],
-        Box::new(u8_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn u8_alias_content() -> SolvedType {
     int_alias_content(unsigned8_type())
@@ -647,35 +554,11 @@ fn u8_alias_content() -> SolvedType {
 
 // I8
 
-#[inline(always)]
-pub fn i8_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_I8,
-        vec![],
-        vec![],
-        Box::new(i8_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn i8_alias_content() -> SolvedType {
     int_alias_content(signed8_type())
 }
 
-// INT
-
-#[inline(always)]
-pub fn int_type(range: SolvedType) -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_INT,
-        vec![(range.clone())],
-        vec![],
-        Box::new(int_alias_content(range)),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn int_alias_content(range: SolvedType) -> SolvedType {
     num_type(integer_type(range))
@@ -912,19 +795,6 @@ fn decimal_alias_content() -> SolvedType {
     SolvedType::EmptyTagUnion
 }
 
-// Dec
-
-#[inline(always)]
-pub fn dec_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::NUM_DEC,
-        vec![],
-        vec![],
-        Box::new(dec_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 fn dec_alias_content() -> SolvedType {
     frac_alias_content(decimal_type())
@@ -941,17 +811,6 @@ pub fn decimal_type() -> SolvedType {
     )
 }
 
-#[inline(always)]
-pub fn bool_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::BOOL_BOOL,
-        vec![],
-        vec![],
-        Box::new(bool_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 fn bool_alias_content() -> SolvedType {
     SolvedType::TagUnion(
         vec![
@@ -962,92 +821,6 @@ fn bool_alias_content() -> SolvedType {
     )
 }
 
-#[inline(always)]
-pub fn ordering_type() -> SolvedType {
-    // [LT, EQ, GT]
-    SolvedType::TagUnion(
-        vec![
-            (TagName("EQ".into()), vec![]),
-            (TagName("GT".into()), vec![]),
-            (TagName("LT".into()), vec![]),
-        ],
-        Box::new(SolvedType::EmptyTagUnion),
-    )
-}
-
-#[inline(always)]
-pub fn result_type(a: SolvedType, e: SolvedType) -> SolvedType {
-    SolvedType::Alias(
-        Symbol::RESULT_RESULT,
-        vec![a.clone(), e.clone()],
-        vec![],
-        Box::new(result_alias_content(a, e)),
-        AliasKind::Structural,
-    )
-}
-
-#[inline(always)]
-pub fn box_type(a: SolvedType) -> SolvedType {
-    SolvedType::Apply(Symbol::BOX_BOX_TYPE, vec![a])
-}
-
-#[inline(always)]
-fn result_alias_content(a: SolvedType, e: SolvedType) -> SolvedType {
-    SolvedType::TagUnion(
-        vec![
-            (TagName("Err".into()), vec![e]),
-            (TagName("Ok".into()), vec![a]),
-        ],
-        Box::new(SolvedType::EmptyTagUnion),
-    )
-}
-
-#[inline(always)]
-pub fn list_type(a: SolvedType) -> SolvedType {
-    SolvedType::Apply(Symbol::LIST_LIST, vec![a])
-}
-
-#[inline(always)]
-pub fn str_type() -> SolvedType {
-    SolvedType::Apply(Symbol::STR_STR, Vec::new())
-}
-
-#[inline(always)]
-pub fn str_utf8_problem_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::STR_UT8_PROBLEM,
-        vec![],
-        vec![],
-        Box::new(str_utf8_problem_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
-#[inline(always)]
-pub fn str_utf8_problem_alias_content() -> SolvedType {
-    SolvedType::Record {
-        fields: vec![
-            ("byteIndex".into(), RecordField::Required(nat_type())),
-            (
-                "problem".into(),
-                RecordField::Required(str_utf8_byte_problem_type()),
-            ),
-        ],
-        ext: Box::new(SolvedType::EmptyRecord),
-    }
-}
-
-#[inline(always)]
-pub fn str_utf8_byte_problem_type() -> SolvedType {
-    SolvedType::Alias(
-        Symbol::STR_UT8_BYTE_PROBLEM,
-        vec![],
-        vec![],
-        Box::new(str_utf8_byte_problem_alias_content()),
-        AliasKind::Structural,
-    )
-}
-
 #[inline(always)]
 pub fn str_utf8_byte_problem_alias_content() -> SolvedType {
     // 1. This must have the same values as the Zig struct Utf8ByteProblem in src/str.zig
@@ -1066,13 +839,3 @@ pub fn str_utf8_byte_problem_alias_content() -> SolvedType {
         Box::new(SolvedType::EmptyTagUnion),
     )
 }
-
-#[inline(always)]
-pub fn set_type(a: SolvedType) -> SolvedType {
-    SolvedType::Apply(Symbol::SET_SET, vec![a])
-}
-
-#[inline(always)]
-pub fn dict_type(key: SolvedType, value: SolvedType) -> SolvedType {
-    SolvedType::Apply(Symbol::DICT_DICT, vec![key, value])
-}

crates/ast/src/constrain.rs

@@ -1937,9 +1937,9 @@ pub mod test_constrain {
     };
     use roc_parse::parser::{SourceError, SyntaxError};
     use roc_region::all::Region;
+    use roc_solve::module::Solved;
     use roc_types::{
         pretty_print::{name_and_print_var, DebugPrint},
-        solved_types::Solved,
         subs::{Subs, VarStore, Variable},
     };
 

crates/ast/src/lang/scope.rs

@@ -5,6 +5,7 @@
 use std::fmt;
 
 use crate::ast_error::ASTResult;
+use crate::builtin_aliases::{self, BuiltinAlias, FreeVars, SolvedType};
 use crate::mem_pool::pool::Pool;
 use crate::mem_pool::pool_str::PoolStr;
 use crate::mem_pool::pool_vec::PoolVec;
@@ -17,11 +18,7 @@ use roc_module::symbol::{
 };
 use roc_problem::can::RuntimeError;
 use roc_region::all::{Loc, Region};
-use roc_types::{
-    builtin_aliases,
-    solved_types::{BuiltinAlias, FreeVars, SolvedType},
-    subs::{VarId, VarStore, Variable},
-};
+use roc_types::subs::{VarId, VarStore, Variable};
 
 use super::core::types::{Alias, Type2, TypeId};
 use super::env::Env;

crates/ast/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod ast_error;
+mod builtin_aliases;
 mod canonicalization;
 pub mod constrain;
 pub mod lang;

crates/ast/src/solve_type.rs

@@ -7,7 +7,7 @@ use roc_error_macros::internal_error;
 use roc_module::ident::TagName;
 use roc_module::symbol::Symbol;
 use roc_region::all::{Loc, Region};
-use roc_types::solved_types::Solved;
+use roc_solve::module::Solved;
 use roc_types::subs::{
     self, AliasVariables, Content, Descriptor, FlatType, Mark, OptVariable, Rank, RecordFields,
     Subs, SubsSlice, UnionLambdas, UnionTags, Variable, VariableSubsSlice,

crates/compiler/load_internal/src/file.rs

@@ -41,10 +41,9 @@ use roc_parse::module::module_defs;
 use roc_parse::parser::{FileError, Parser, SyntaxError};
 use roc_region::all::{LineInfo, Loc, Region};
 use roc_reporting::report::RenderTarget;
-use roc_solve::module::SolvedModule;
+use roc_solve::module::{Solved, SolvedModule};
 use roc_solve::solve;
 use roc_target::TargetInfo;
-use roc_types::solved_types::Solved;
 use roc_types::subs::{ExposedTypesStorageSubs, Subs, VarStore, Variable};
 use roc_types::types::{Alias, AliasKind};
 use std::collections::hash_map::Entry::{Occupied, Vacant};
@@ -4875,7 +4874,7 @@ fn build_pending_specializations<'a>(
 
     Msg::FoundSpecializations {
         module_id: home,
-        solved_subs: roc_types::solved_types::Solved(subs),
+        solved_subs: Solved(subs),
         ident_ids,
         layout_cache,
         procs_base,

crates/compiler/solve/src/module.rs

@@ -8,10 +8,28 @@ use roc_collections::VecMap;
 use roc_derive_key::GlobalDerivedSymbols;
 use roc_error_macros::internal_error;
 use roc_module::symbol::Symbol;
-use roc_types::solved_types::Solved;
 use roc_types::subs::{Content, ExposedTypesStorageSubs, FlatType, StorageSubs, Subs, Variable};
 use roc_types::types::Alias;
 
+/// A marker that a given Subs has been solved.
+/// The only way to obtain a Solved<Subs> is by running the solver on it.
+#[derive(Clone, Debug)]
+pub struct Solved<T>(pub T);
+
+impl<T> Solved<T> {
+    pub fn inner(&self) -> &'_ T {
+        &self.0
+    }
+
+    pub fn inner_mut(&mut self) -> &'_ mut T {
+        &mut self.0
+    }
+
+    pub fn into_inner(self) -> T {
+        self.0
+    }
+}
+
 #[derive(Debug)]
 pub struct SolvedModule {
     pub problems: Vec<solve::TypeError>,

crates/compiler/solve/src/solve.rs

@@ -2,6 +2,7 @@ use crate::ability::{
     resolve_ability_specialization, type_implementing_specialization, AbilityImplError,
     DeferredObligations, PendingDerivesTable, RequestedDeriveKey, Resolved, Unfulfilled,
 };
+use crate::module::Solved;
 use bumpalo::Bump;
 use roc_can::abilities::{AbilitiesStore, MemberSpecialization};
 use roc_can::constraint::Constraint::{self, *};
@@ -18,7 +19,6 @@ use roc_module::ident::TagName;
 use roc_module::symbol::{ModuleId, Symbol};
 use roc_problem::can::CycleEntry;
 use roc_region::all::{Loc, Region};
-use roc_types::solved_types::Solved;
 use roc_types::subs::{
     self, AliasVariables, Content, Descriptor, FlatType, GetSubsSlice, LambdaSet, Mark,
     OptVariable, Rank, RecordFields, Subs, SubsIndex, SubsSlice, UlsOfVar, UnionLabels,

crates/compiler/types/src/lib.rs

@@ -1,10 +1,8 @@
 #![warn(clippy::dbg_macro)]
 // See github.com/rtfeldman/roc/issues/800 for discussion of the large_enum_variant check.
 #![allow(clippy::large_enum_variant)]
-pub mod builtin_aliases;
 pub mod num;
 pub mod pretty_print;
-pub mod solved_types;
 pub mod subs;
 pub mod types;
 mod unification_table;

crates/compiler/types/src/solved_types.rs

@@ -1,90 +0,0 @@
-use crate::subs::{VarId, Variable};
-use crate::types::{AliasKind, Problem, RecordField};
-use roc_collections::all::ImMap;
-use roc_module::ident::{Lowercase, TagName};
-use roc_module::symbol::Symbol;
-use roc_region::all::{Loc, Region};
-
-/// A marker that a given Subs has been solved.
-/// The only way to obtain a Solved<Subs> is by running the solver on it.
-#[derive(Clone, Debug)]
-pub struct Solved<T>(pub T);
-
-impl<T> Solved<T> {
-    pub fn inner(&self) -> &'_ T {
-        &self.0
-    }
-
-    pub fn inner_mut(&mut self) -> &'_ mut T {
-        &mut self.0
-    }
-
-    pub fn into_inner(self) -> T {
-        self.0
-    }
-}
-
-#[derive(Debug, Clone)]
-pub struct SolvedLambdaSet(pub SolvedType);
-
-/// This is a fully solved type, with no Variables remaining in it.
-#[derive(Debug, Clone)]
-pub enum SolvedType {
-    /// A function. The types of its arguments, then the type of its return value.
-    Func(Vec<SolvedType>, Box<SolvedType>, Box<SolvedType>),
-    /// Applying a type to some arguments (e.g. Map.Map String Int)
-    Apply(Symbol, Vec<SolvedType>),
-    /// A bound type variable, e.g. `a` in `(a -> a)`
-    Rigid(Lowercase),
-    Flex(VarId),
-    Wildcard,
-    /// Inline type alias, e.g. `as List a` in `[Cons a (List a), Nil] as List a`
-    Record {
-        fields: Vec<(Lowercase, RecordField<SolvedType>)>,
-        /// The row type variable in an open record, e.g. the `r` in `{ name: Str }r`.
-        /// This is None if it's a closed record annotation like `{ name: Str }`.
-        ext: Box<SolvedType>,
-    },
-    EmptyRecord,
-    TagUnion(Vec<(TagName, Vec<SolvedType>)>, Box<SolvedType>),
-    LambdaTag(Symbol, Vec<SolvedType>),
-    FunctionOrTagUnion(TagName, Symbol, Box<SolvedType>),
-    RecursiveTagUnion(VarId, Vec<(TagName, Vec<SolvedType>)>, Box<SolvedType>),
-    EmptyTagUnion,
-    /// A type from an Invalid module
-    Erroneous(Problem),
-
-    Alias(
-        Symbol,
-        Vec<SolvedType>,
-        Vec<SolvedLambdaSet>,
-        Box<SolvedType>,
-        AliasKind,
-    ),
-
-    HostExposedAlias {
-        name: Symbol,
-        arguments: Vec<SolvedType>,
-        lambda_set_variables: Vec<SolvedLambdaSet>,
-        actual_var: VarId,
-        actual: Box<SolvedType>,
-    },
-
-    /// A type error
-    Error,
-}
-
-#[derive(Clone, Debug)]
-pub struct BuiltinAlias {
-    pub region: Region,
-    pub vars: Vec<Loc<Lowercase>>,
-    pub typ: SolvedType,
-    pub kind: AliasKind,
-}
-
-#[derive(Debug, Clone, Default)]
-pub struct FreeVars {
-    pub named_vars: ImMap<Lowercase, Variable>,
-    pub unnamed_vars: ImMap<VarId, Variable>,
-    pub wildcards: Vec<Variable>,
-}

crates/editor/src/editor/mvc/ed_update.rs

@@ -59,9 +59,9 @@ use roc_collections::all::MutMap;
 use roc_module::ident::Lowercase;
 use roc_module::symbol::Symbol;
 use roc_region::all::Region;
+use roc_solve::module::Solved;
 use roc_types::pretty_print::name_and_print_var;
 use roc_types::pretty_print::DebugPrint;
-use roc_types::solved_types::Solved;
 use roc_types::subs::{Subs, VarStore, Variable};
 use snafu::OptionExt;
 use threadpool::ThreadPool;