Merge #1757

1757: Assoc type bindings r=flodiebold a=flodiebold

This adds support for type bindings (bounds like `where T: Iterator<Item = u32>`).

It doesn't yet work in as many situations as I'd like because of some [Chalk problems](https://github.com/rust-lang/chalk/issues/234). But it works in some situations, and will at least not bitrot this way ;)

(part of the problem is that we use `Normalize` to normalize associated types, but produce `ProjectionEq` goals from where clauses, so Chalk can't normalize using the environment; this would be fixed by using `ProjectionEq` for normalization, which I think is the 'proper' way, but then we'd run into those ambiguity problems everywhere...)

Co-authored-by: Florian Diebold <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index b89a40b4b..ec3b7ffef 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -30,7 +30,7 @@ use super::{
     autoderef, lower, method_resolution, op, primitive,
     traits::{Guidance, Obligation, ProjectionPredicate, Solution},
     ApplicationTy, CallableDef, InEnvironment, ProjectionTy, Substs, TraitEnvironment, TraitRef,
-    Ty, TypableDef, TypeCtor,
+    Ty, TypableDef, TypeCtor, TypeWalk,
 };
 use crate::{
     adt::VariantDef,