Rename subdiagnostic fields that do not need to be unique now

Author: IntQuant

compiler/rustc_error_messages/locales/en-US/infer.ftl

@@ -233,15 +233,15 @@ infer_actual_impl_expl_expected_other_nothing = {$leading_ellipsis ->
     *[false] {""}
 }`{$ty_or_sig}` must implement `{$trait_path}`
 
-infer_actual_impl_expl_but_actually_implements_trait = ...but it actually implements `{$trait_path_2}`{$has_lifetime ->
+infer_actual_impl_expl_but_actually_implements_trait = ...but it actually implements `{$trait_path}`{$has_lifetime ->
     [true] , for some specific lifetime `'{$lifetime}`
     *[false] {""}
 }
-infer_actual_impl_expl_but_actually_implemented_for_ty = ...but `{$trait_path_2}` is actually implemented for the type `{$ty}`{$has_lifetime ->
+infer_actual_impl_expl_but_actually_implemented_for_ty = ...but `{$trait_path}` is actually implemented for the type `{$ty}`{$has_lifetime ->
     [true] , for some specific lifetime `'{$lifetime}`
     *[false] {""}
 }
-infer_actual_impl_expl_but_actually_ty_implements = ...but `{$ty}` actually implements `{$trait_path_2}`{$has_lifetime ->
+infer_actual_impl_expl_but_actually_ty_implements = ...but `{$ty}` actually implements `{$trait_path}`{$has_lifetime ->
     [true] , for some specific lifetime `'{$lifetime}`
     *[false] {""}
 }

compiler/rustc_infer/src/errors/mod.rs

@@ -617,21 +617,16 @@ pub enum ActualImplExplNotes {
     #[note(infer::actual_impl_expl_expected_other_nothing)]
     ExpectedOtherNothing { leading_ellipsis: bool, ty_or_sig: String, trait_path: String },
     #[note(infer::actual_impl_expl_but_actually_implements_trait)]
-    ButActuallyImplementsTrait { trait_path_2: String, has_lifetime: bool, lifetime: usize },
+    ButActuallyImplementsTrait { trait_path: String, has_lifetime: bool, lifetime: usize },
     #[note(infer::actual_impl_expl_but_actually_implemented_for_ty)]
     ButActuallyImplementedForTy {
-        trait_path_2: String,
+        trait_path: String,
         has_lifetime: bool,
         lifetime: usize,
         ty: String,
     },
     #[note(infer::actual_impl_expl_but_actually_ty_implements)]
-    ButActuallyTyImplements {
-        trait_path_2: String,
-        has_lifetime: bool,
-        lifetime: usize,
-        ty: String,
-    },
+    ButActuallyTyImplements { trait_path: String, has_lifetime: bool, lifetime: usize, ty: String },
 }
 
 pub enum ActualImplExpectedKind {

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/placeholder_error.rs

@@ -474,27 +474,22 @@ impl<'tcx> NiceRegionError<'_, 'tcx> {
             None => true,
         };
 
-        let trait_path_2 = actual_trait_ref.map(|tr| tr.print_only_trait_path()).to_string();
+        let trait_path = actual_trait_ref.map(|tr| tr.print_only_trait_path()).to_string();
         let ty = actual_trait_ref.map(|tr| tr.self_ty()).to_string();
         let has_lifetime = actual_has_vid.is_some();
         let lifetime = actual_has_vid.unwrap_or_default();
 
         let note_2 = if same_self_type {
-            ActualImplExplNotes::ButActuallyImplementsTrait { trait_path_2, has_lifetime, lifetime }
+            ActualImplExplNotes::ButActuallyImplementsTrait { trait_path, has_lifetime, lifetime }
         } else if passive_voice {
             ActualImplExplNotes::ButActuallyImplementedForTy {
-                trait_path_2,
+                trait_path,
                 ty,
                 has_lifetime,
                 lifetime,
             }
         } else {
-            ActualImplExplNotes::ButActuallyTyImplements {
-                trait_path_2,
-                ty,
-                has_lifetime,
-                lifetime,
-            }
+            ActualImplExplNotes::ButActuallyTyImplements { trait_path, ty, has_lifetime, lifetime }
         };
 
         vec![note_1, note_2]