1 files changed, 0 insertions, 164 deletions

diff --git a/crates/ra_hir/src/ty/infer/unify.rs b/crates/ra_hir/src/ty/infer/unify.rs
deleted file mode 100644
index 64d9394cf..000000000
--- a/crates/ra_hir/src/ty/infer/unify.rs
+++ /dev/null
@@ -1,164 +0,0 @@
-//! Unification and canonicalization logic.
-
-use super::{InferenceContext, Obligation};
-use crate::db::HirDatabase;
-use crate::ty::{
-    Canonical, InEnvironment, InferTy, ProjectionPredicate, ProjectionTy, Substs, TraitRef, Ty,
-    TypeWalk,
-};
-use crate::util::make_mut_slice;
-
-impl<'a, D: HirDatabase> InferenceContext<'a, D> {
-    pub(super) fn canonicalizer<'b>(&'b mut self) -> Canonicalizer<'a, 'b, D>
-    where
-        'a: 'b,
-    {
-        Canonicalizer { ctx: self, free_vars: Vec::new(), var_stack: Vec::new() }
-    }
-}
-
-pub(super) struct Canonicalizer<'a, 'b, D: HirDatabase>
-where
-    'a: 'b,
-{
-    ctx: &'b mut InferenceContext<'a, D>,
-    free_vars: Vec<InferTy>,
-    /// A stack of type variables that is used to detect recursive types (which
-    /// are an error, but we need to protect against them to avoid stack
-    /// overflows).
-    var_stack: Vec<super::TypeVarId>,
-}
-
-pub(super) struct Canonicalized<T> {
-    pub value: Canonical<T>,
-    free_vars: Vec<InferTy>,
-}
-
-impl<'a, 'b, D: HirDatabase> Canonicalizer<'a, 'b, D>
-where
-    'a: 'b,
-{
-    fn add(&mut self, free_var: InferTy) -> usize {
-        self.free_vars.iter().position(|&v| v == free_var).unwrap_or_else(|| {
-            let next_index = self.free_vars.len();
-            self.free_vars.push(free_var);
-            next_index
-        })
-    }
-
-    fn do_canonicalize_ty(&mut self, ty: Ty) -> Ty {
-        ty.fold(&mut |ty| match ty {
-            Ty::Infer(tv) => {
-                let inner = tv.to_inner();
-                if self.var_stack.contains(&inner) {
-                    // recursive type
-                    return tv.fallback_value();
-                }
-                if let Some(known_ty) =
-                    self.ctx.var_unification_table.inlined_probe_value(inner).known()
-                {
-                    self.var_stack.push(inner);
-                    let result = self.do_canonicalize_ty(known_ty.clone());
-                    self.var_stack.pop();
-                    result
-                } else {
-                    let root = self.ctx.var_unification_table.find(inner);
-                    let free_var = match tv {
-                        InferTy::TypeVar(_) => InferTy::TypeVar(root),
-                        InferTy::IntVar(_) => InferTy::IntVar(root),
-                        InferTy::FloatVar(_) => InferTy::FloatVar(root),
-                        InferTy::MaybeNeverTypeVar(_) => InferTy::MaybeNeverTypeVar(root),
-                    };
-                    let position = self.add(free_var);
-                    Ty::Bound(position as u32)
-                }
-            }
-            _ => ty,
-        })
-    }
-
-    fn do_canonicalize_trait_ref(&mut self, mut trait_ref: TraitRef) -> TraitRef {
-        for ty in make_mut_slice(&mut trait_ref.substs.0) {
-            *ty = self.do_canonicalize_ty(ty.clone());
-        }
-        trait_ref
-    }
-
-    fn into_canonicalized<T>(self, result: T) -> Canonicalized<T> {
-        Canonicalized {
-            value: Canonical { value: result, num_vars: self.free_vars.len() },
-            free_vars: self.free_vars,
-        }
-    }
-
-    fn do_canonicalize_projection_ty(&mut self, mut projection_ty: ProjectionTy) -> ProjectionTy {
-        for ty in make_mut_slice(&mut projection_ty.parameters.0) {
-            *ty = self.do_canonicalize_ty(ty.clone());
-        }
-        projection_ty
-    }
-
-    fn do_canonicalize_projection_predicate(
-        &mut self,
-        projection: ProjectionPredicate,
-    ) -> ProjectionPredicate {
-        let ty = self.do_canonicalize_ty(projection.ty);
-        let projection_ty = self.do_canonicalize_projection_ty(projection.projection_ty);
-
-        ProjectionPredicate { ty, projection_ty }
-    }
-
-    // FIXME: add some point, we need to introduce a `Fold` trait that abstracts
-    // over all the things that can be canonicalized (like Chalk and rustc have)
-
-    pub(crate) fn canonicalize_ty(mut self, ty: Ty) -> Canonicalized<Ty> {
-        let result = self.do_canonicalize_ty(ty);
-        self.into_canonicalized(result)
-    }
-
-    pub(crate) fn canonicalize_obligation(
-        mut self,
-        obligation: InEnvironment<Obligation>,
-    ) -> Canonicalized<InEnvironment<Obligation>> {
-        let result = match obligation.value {
-            Obligation::Trait(tr) => Obligation::Trait(self.do_canonicalize_trait_ref(tr)),
-            Obligation::Projection(pr) => {
-                Obligation::Projection(self.do_canonicalize_projection_predicate(pr))
-            }
-        };
-        self.into_canonicalized(InEnvironment {
-            value: result,
-            environment: obligation.environment,
-        })
-    }
-}
-
-impl<T> Canonicalized<T> {
-    pub fn decanonicalize_ty(&self, mut ty: Ty) -> Ty {
-        ty.walk_mut_binders(
-            &mut |ty, binders| match ty {
-                &mut Ty::Bound(idx) => {
-                    if idx as usize >= binders && (idx as usize - binders) < self.free_vars.len() {
-                        *ty = Ty::Infer(self.free_vars[idx as usize - binders]);
-                    }
-                }
-                _ => {}
-            },
-            0,
-        );
-        ty
-    }
-
-    pub fn apply_solution(
-        &self,
-        ctx: &mut InferenceContext<'_, impl HirDatabase>,
-        solution: Canonical<Vec<Ty>>,
-    ) {
-        // the solution may contain new variables, which we need to convert to new inference vars
-        let new_vars = Substs((0..solution.num_vars).map(|_| ctx.new_type_var()).collect());
-        for (i, ty) in solution.value.into_iter().enumerate() {
-            let var = self.free_vars[i];
-            ctx.unify(&Ty::Infer(var), &ty.subst_bound_vars(&new_vars));
-        }
-    }
-}