Remove unused arg from path_append_impl.

None of the impls use it.

Author: nnethercote

compiler/rustc_const_eval/src/util/type_name.rs

@@ -89,7 +89,6 @@ impl<'tcx> Printer<'tcx> for AbsolutePathPrinter<'tcx> {
     fn path_append_impl(
         &mut self,
         print_prefix: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-        _disambiguated_data: &DisambiguatedDefPathData,
         self_ty: Ty<'tcx>,
         trait_ref: Option<ty::TraitRef<'tcx>>,
     ) -> Result<(), PrintError> {

compiler/rustc_lint/src/context.rs

@@ -803,7 +803,6 @@ impl<'tcx> LateContext<'tcx> {
             fn path_append_impl(
                 &mut self,
                 print_prefix: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-                _disambiguated_data: &DisambiguatedDefPathData,
                 self_ty: Ty<'tcx>,
                 trait_ref: Option<ty::TraitRef<'tcx>>,
             ) -> Result<(), PrintError> {

compiler/rustc_middle/src/ty/print/mod.rs

@@ -88,7 +88,6 @@ pub trait Printer<'tcx>: Sized {
     fn path_append_impl(
         &mut self,
         print_prefix: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-        disambiguated_data: &DisambiguatedDefPathData,
         self_ty: Ty<'tcx>,
         trait_ref: Option<ty::TraitRef<'tcx>>,
     ) -> Result<(), PrintError>;
@@ -236,12 +235,7 @@ pub trait Printer<'tcx>: Sized {
             // If the impl is not co-located with either self-type or
             // trait-type, then fallback to a format that identifies
             // the module more clearly.
-            self.path_append_impl(
-                |p| p.print_def_path(parent_def_id, &[]),
-                &key.disambiguated_data,
-                self_ty,
-                impl_trait_ref,
-            )
+            self.path_append_impl(|p| p.print_def_path(parent_def_id, &[]), self_ty, impl_trait_ref)
         } else {
             // Otherwise, try to give a good form that would be valid language
             // syntax. Preferably using associated item notation.

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -2344,7 +2344,6 @@ impl<'tcx> Printer<'tcx> for FmtPrinter<'_, 'tcx> {
     fn path_append_impl(
         &mut self,
         print_prefix: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-        _disambiguated_data: &DisambiguatedDefPathData,
         self_ty: Ty<'tcx>,
         trait_ref: Option<ty::TraitRef<'tcx>>,
     ) -> Result<(), PrintError> {

compiler/rustc_symbol_mangling/src/legacy.rs

@@ -332,7 +332,6 @@ impl<'tcx> Printer<'tcx> for SymbolPrinter<'tcx> {
     fn path_append_impl(
         &mut self,
         print_prefix: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-        _disambiguated_data: &DisambiguatedDefPathData,
         self_ty: Ty<'tcx>,
         trait_ref: Option<ty::TraitRef<'tcx>>,
     ) -> Result<(), PrintError> {

compiler/rustc_symbol_mangling/src/v0.rs

@@ -846,7 +846,6 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
     fn path_append_impl(
         &mut self,
         _: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-        _: &DisambiguatedDefPathData,
         _: Ty<'tcx>,
         _: Option<ty::TraitRef<'tcx>>,
     ) -> Result<(), PrintError> {

compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs

@@ -269,7 +269,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             fn path_append_impl(
                 &mut self,
                 _print_prefix: impl FnOnce(&mut Self) -> Result<(), PrintError>,
-                _disambiguated_data: &DisambiguatedDefPathData,
                 _self_ty: Ty<'tcx>,
                 _trait_ref: Option<ty::TraitRef<'tcx>>,
             ) -> Result<(), PrintError> {