Auto merge of #608 - Areredify:ptr_debug_print, r=jackh726,detrumi

fix debug print of pointer types Fixes confusing debug print of pointer types, previously `&'a T` it was printed as `Not<!0_0, T>` and `*const T` was printed as `Not<T>`, which was not ideal.
rust-lang · Sep 14, 2020 · 3ea88b7 · 3ea88b7
2 parents 758e38b + 3434f66
commit 3ea88b7
Showing 1 changed file with 16 additions and 2 deletions.
diff --git a/chalk-ir/src/debug.rs b/chalk-ir/src/debug.rs
@@ -186,8 +186,22 @@ impl<I: Interner> Debug for TypeName<I> {
             TypeName::OpaqueType(opaque_ty) => write!(fmt, "!{:?}", opaque_ty),
             TypeName::Slice => write!(fmt, "{{slice}}"),
             TypeName::FnDef(fn_def) => write!(fmt, "{:?}", fn_def),
-            TypeName::Raw(mutability) => write!(fmt, "{:?}", mutability),
-            TypeName::Ref(mutability) => write!(fmt, "{:?}", mutability),
+            TypeName::Ref(mutability) => write!(
+                fmt,
+                "{}",
+                match mutability {
+                    Mutability::Mut => "{{&mut}}",
+                    Mutability::Not => "{{&}}",
+                }
+            ),
+            TypeName::Raw(mutability) => write!(
+                fmt,
+                "{}",
+                match mutability {
+                    Mutability::Mut => "{{*mut}}",
+                    Mutability::Not => "{{*const}}",
+                }
+            ),
             TypeName::Never => write!(fmt, "Never"),
             TypeName::Array => write!(fmt, "{{array}}"),
             TypeName::Closure(id) => write!(fmt, "{{closure:{:?}}}", id),