Rename OpaqueTyOrigin variants

Author: varkor

Diff for: src/librustc/hir/lowering.rs

@@ -1763,7 +1763,7 @@ impl<'a> LoweringContext<'a> {
                 },
                 bounds: hir_bounds,
                 impl_trait_fn: fn_def_id,
-                origin: hir::OpaqueTyOrigin::ReturnImplTrait,
+                origin: hir::OpaqueTyOrigin::FnReturn,
             };
 
             trace!("exist ty from impl trait def-index: {:#?}", opaque_ty_def_index);
@@ -3451,7 +3451,7 @@ impl<'a> LoweringContext<'a> {
                     bounds: self.lower_param_bounds(b,
                         ImplTraitContext::OpaqueTy(None)),
                     impl_trait_fn: None,
-                    origin: hir::OpaqueTyOrigin::TraitAliasImplTrait,
+                    origin: hir::OpaqueTyOrigin::TypeAlias,
                 },
             ),
             ItemKind::Enum(ref enum_definition, ref generics) => {

Diff for: src/librustc/hir/mod.rs

@@ -1933,9 +1933,9 @@ pub struct OpaqueTy {
 #[derive(Copy, Clone, RustcEncodable, RustcDecodable, Debug, HashStable)]
 pub enum OpaqueTyOrigin {
     /// `type Foo = impl Trait;`
-    TraitAliasImplTrait,
+    TypeAlias,
     /// `-> impl Trait`
-    ReturnImplTrait,
+    FnReturn,
     /// `async fn`
     AsyncFn,
 }

Diff for: src/librustc/infer/opaque_types/mod.rs

@@ -495,8 +495,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             hir::OpaqueTyOrigin::AsyncFn => return false,
 
             // Otherwise, generate the label we'll use in the error message.
-            hir::OpaqueTyOrigin::TraitAliasImplTrait => "impl Trait",
-            hir::OpaqueTyOrigin::ReturnImplTrait => "impl Trait",
+            hir::OpaqueTyOrigin::TypeAlias => "impl Trait",
+            hir::OpaqueTyOrigin::FnReturn => "impl Trait",
         };
         let msg = format!("ambiguous lifetime bound in `{}`", context_name);
         let mut err = self.tcx.sess.struct_span_err(span, &msg);
@@ -1052,7 +1052,7 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
                                     origin,
                                 ),
                                 _ => {
-                                    (def_scope_default(), hir::OpaqueTyOrigin::TraitAliasImplTrait)
+                                    (def_scope_default(), hir::OpaqueTyOrigin::TypeAlias)
                                 }
                             },
                             Some(Node::ImplItem(item)) => match item.node {
@@ -1062,10 +1062,10 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
                                         self.parent_def_id,
                                         opaque_hir_id,
                                     ),
-                                    hir::OpaqueTyOrigin::TraitAliasImplTrait,
+                                    hir::OpaqueTyOrigin::TypeAlias,
                                 ),
                                 _ => {
-                                    (def_scope_default(), hir::OpaqueTyOrigin::TraitAliasImplTrait)
+                                    (def_scope_default(), hir::OpaqueTyOrigin::TypeAlias)
                                 }
                             },
                             _ => bug!(