Don't store a redundant span in user-type projections

This span is already present in the corresponding
`CanonicalUserTypeAnnotation`, and can be retrieved via the annotation's ID.

2 files changed, 7 insertions, 16 deletions

diff --git a/compiler/rustc_middle/src/mir/mod.rs b/compiler/rustc_middle/src/mir/mod.rs
index d74a917f33c..71fed4b3e1e 100644
--- a/compiler/rustc_middle/src/mir/mod.rs
+++ b/compiler/rustc_middle/src/mir/mod.rs
@@ -1494,7 +1494,7 @@ pub struct SourceScopeLocalData {
 /// &'static str`.
 #[derive(Clone, Debug, TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]
 pub struct UserTypeProjections {
-    pub contents: Vec<(UserTypeProjection, Span)>,
+    pub contents: Vec<UserTypeProjection>,
 }
 
 impl<'tcx> UserTypeProjections {
@@ -1506,26 +1506,17 @@ impl<'tcx> UserTypeProjections {
         self.contents.is_empty()
     }
 
-    pub fn projections_and_spans(
-        &self,
-    ) -> impl Iterator<Item = &(UserTypeProjection, Span)> + ExactSizeIterator {
-        self.contents.iter()
-    }
-
     pub fn projections(&self) -> impl Iterator<Item = &UserTypeProjection> + ExactSizeIterator {
-        self.contents.iter().map(|&(ref user_type, _span)| user_type)
+        self.contents.iter()
     }
 
-    pub fn push_user_type(mut self, base_user_ty: UserTypeAnnotationIndex, span: Span) -> Self {
-        self.contents.push((UserTypeProjection { base: base_user_ty, projs: vec![] }, span));
+    pub fn push_user_type(mut self, base_user_type: UserTypeAnnotationIndex) -> Self {
+        self.contents.push(UserTypeProjection { base: base_user_type, projs: vec![] });
         self
     }
 
-    fn map_projections(
-        mut self,
-        mut f: impl FnMut(UserTypeProjection) -> UserTypeProjection,
-    ) -> Self {
-        self.contents = self.contents.into_iter().map(|(proj, span)| (f(proj), span)).collect();
+    fn map_projections(mut self, f: impl FnMut(UserTypeProjection) -> UserTypeProjection) -> Self {
+        self.contents = self.contents.into_iter().map(f).collect();
         self
     }
 
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
index 193806f238b..98e8f269c57 100644
--- a/compiler/rustc_middle/src/mir/visit.rs
+++ b/compiler/rustc_middle/src/mir/visit.rs
@@ -857,7 +857,7 @@ macro_rules! make_mir_visitor {
                     source_info: *source_info,
                 });
                 if let Some(user_ty) = user_ty {
-                    for (user_ty, _) in & $($mutability)? user_ty.contents {
+                    for user_ty in & $($mutability)? user_ty.contents {
                         self.visit_user_type_projection(user_ty);
                     }
                 }