TypeIdHasher: Let projections be hashed implicitly by the visitor.

Author: michaelwoerister

src/librustc/ty/util.rs

@@ -453,17 +453,6 @@ impl<'a, 'gcx, 'tcx> TypeVisitor<'tcx> for TypeIdHasher<'a, 'gcx, 'tcx> {
                 // Hash region and builtin bounds.
                 data.region_bound.visit_with(self);
                 self.hash(data.builtin_bounds);
-
-                // Only projection bounds are left, hash them.
-                self.hash(data.projection_bounds.len());
-                for bound in &data.projection_bounds {
-                    self.def_id(bound.0.trait_ref.def_id);
-                    self.hash(bound.0.item_name);
-                    bound.visit_with(self);
-                }
-
-                // Bypass super_visit_with, we've visited everything.
-                return false;
             }
             TyTuple(tys) => {
                 self.hash(tys.len());

src/test/run-pass/auxiliary/typeid-intrinsic-aux1.rs

@@ -22,6 +22,8 @@ pub type F = Option<isize>;
 pub type G = usize;
 pub type H = &'static str;
 pub type I = Box<Fn()>;
+pub type I32Iterator = Iterator<Item=i32>;
+pub type U32Iterator = Iterator<Item=u32>;
 
 pub fn id_A() -> TypeId { TypeId::of::<A>() }
 pub fn id_B() -> TypeId { TypeId::of::<B>() }
@@ -34,3 +36,6 @@ pub fn id_H() -> TypeId { TypeId::of::<H>() }
 pub fn id_I() -> TypeId { TypeId::of::<I>() }
 
 pub fn foo<T: Any>() -> TypeId { TypeId::of::<T>() }
+
+pub fn id_i32_iterator() -> TypeId { TypeId::of::<I32Iterator>() }
+pub fn id_u32_iterator() -> TypeId { TypeId::of::<U32Iterator>() }

src/test/run-pass/auxiliary/typeid-intrinsic-aux2.rs

@@ -22,6 +22,8 @@ pub type F = Option<isize>;
 pub type G = usize;
 pub type H = &'static str;
 pub type I = Box<Fn()>;
+pub type I32Iterator = Iterator<Item=i32>;
+pub type U32Iterator = Iterator<Item=u32>;
 
 pub fn id_A() -> TypeId { TypeId::of::<A>() }
 pub fn id_B() -> TypeId { TypeId::of::<B>() }
@@ -34,3 +36,6 @@ pub fn id_H() -> TypeId { TypeId::of::<H>() }
 pub fn id_I() -> TypeId { TypeId::of::<I>() }
 
 pub fn foo<T: Any>() -> TypeId { TypeId::of::<T>() }
+
+pub fn id_i32_iterator() -> TypeId { TypeId::of::<I32Iterator>() }
+pub fn id_u32_iterator() -> TypeId { TypeId::of::<U32Iterator>() }

src/test/run-pass/typeid-intrinsic.rs

@@ -78,4 +78,13 @@ pub fn main() {
     b.hash(&mut s2);
 
     assert_eq!(s1.finish(), s2.finish());
+
+    // Check projections
+
+    assert_eq!(TypeId::of::<other1::I32Iterator>(), other1::id_i32_iterator());
+    assert_eq!(TypeId::of::<other1::U32Iterator>(), other1::id_u32_iterator());
+    assert_eq!(other1::id_i32_iterator(), other2::id_i32_iterator());
+    assert_eq!(other1::id_u32_iterator(), other2::id_u32_iterator());
+    assert!(other1::id_i32_iterator() != other1::id_u32_iterator());
+    assert!(TypeId::of::<other1::I32Iterator>() != TypeId::of::<other1::U32Iterator>());
 }