Rework obligation handling

We can't do the easy hack that we did before anymore, where we kept
track of whether any inference variables changed since the last time we
rechecked obligations. Instead, we store the obligations in
canonicalized form; that way we can easily check the inference variables
to see whether they have changed since the goal was canonicalized.

1 files changed, 2 insertions, 1 deletions

diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 56f60c46b..72093d75a 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -45,7 +45,7 @@ use hir_def::{
 };
 use stdx::always;
 
-use crate::{db::HirDatabase, display::HirDisplay, utils::generics};
+use crate::{db::HirDatabase, utils::generics};
 
 pub use autoderef::autoderef;
 pub use builder::TyBuilder;
@@ -114,6 +114,7 @@ pub type FnSig = chalk_ir::FnSig<Interner>;
 
 pub type InEnvironment<T> = chalk_ir::InEnvironment<T>;
 pub type DomainGoal = chalk_ir::DomainGoal<Interner>;
+pub type Goal = chalk_ir::Goal<Interner>;
 pub type AliasEq = chalk_ir::AliasEq<Interner>;
 pub type Solution = chalk_solve::Solution<Interner>;
 pub type ConstrainedSubst = chalk_ir::ConstrainedSubst<Interner>;