Remove Target::ImplTraitPlaceholder

Author: spastorino

compiler/rustc_hir/src/target.rs

@@ -36,7 +36,6 @@ pub enum Target {
     GlobalAsm,
     TyAlias,
     OpaqueTy,
-    ImplTraitPlaceholder,
     Enum,
     Variant,
     Struct,
@@ -80,13 +79,7 @@ impl Target {
             ItemKind::ForeignMod { .. } => Target::ForeignMod,
             ItemKind::GlobalAsm(..) => Target::GlobalAsm,
             ItemKind::TyAlias(..) => Target::TyAlias,
-            ItemKind::OpaqueTy(ref opaque) => {
-                if opaque.in_trait {
-                    Target::ImplTraitPlaceholder
-                } else {
-                    Target::OpaqueTy
-                }
-            }
+            ItemKind::OpaqueTy(..) => Target::OpaqueTy,
             ItemKind::Enum(..) => Target::Enum,
             ItemKind::Struct(..) => Target::Struct,
             ItemKind::Union(..) => Target::Union,
@@ -109,8 +102,7 @@ impl Target {
             DefKind::ForeignMod => Target::ForeignMod,
             DefKind::GlobalAsm => Target::GlobalAsm,
             DefKind::TyAlias => Target::TyAlias,
-            DefKind::OpaqueTy => Target::OpaqueTy,
-            DefKind::ImplTraitPlaceholder => Target::ImplTraitPlaceholder,
+            DefKind::OpaqueTy | DefKind::ImplTraitPlaceholder => Target::OpaqueTy,
             DefKind::Enum => Target::Enum,
             DefKind::Struct => Target::Struct,
             DefKind::Union => Target::Union,
@@ -165,7 +157,6 @@ impl Target {
             Target::GlobalAsm => "global asm",
             Target::TyAlias => "type alias",
             Target::OpaqueTy => "opaque type",
-            Target::ImplTraitPlaceholder => "opaque type in trait",
             Target::Enum => "enum",
             Target::Variant => "enum variant",
             Target::Struct => "struct",

compiler/rustc_passes/src/check_attr.rs

@@ -669,7 +669,6 @@ impl CheckAttrVisitor<'_> {
             | Target::GlobalAsm
             | Target::TyAlias
             | Target::OpaqueTy
-            | Target::ImplTraitPlaceholder
             | Target::Enum
             | Target::Variant
             | Target::Struct