From 6a30ce639f9eeba7d085721d219553635f32c280 Mon Sep 17 00:00:00 2001
From: Dmitry Kadashev <dkadashev@gmail.com>
Date: Thu, 31 Oct 2019 16:57:29 +0700
Subject: [PATCH] Add type parameter name to type mismatch error messages

Part of #47319.

This just adds type parameter name to type mismatch error message, so
e.g. the following:

```
expected enum `std::option::Option`, found type parameter
```

becomes

```
expected enum `std::option::Option`, found type parameter `T`
```
---
 src/librustc/ty/error.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc/ty/error.rs b/src/librustc/ty/error.rs
index 77613b548cfdb..4ef6a162c8b6f 100644
--- a/src/librustc/ty/error.rs
+++ b/src/librustc/ty/error.rs
@@ -241,7 +241,7 @@ impl<'tcx> ty::TyS<'tcx> {
             ty::Infer(ty::FreshFloatTy(_)) => "fresh floating-point type".into(),
             ty::Projection(_) => "associated type".into(),
             ty::UnnormalizedProjection(_) => "non-normalized associated type".into(),
-            ty::Param(_) => "type parameter".into(),
+            ty::Param(p) => format!("type parameter `{}`", p).into(),
             ty::Opaque(..) => "opaque type".into(),
             ty::Error => "type error".into(),
         }