Rollup merge of #120590 - compiler-errors:dead, r=Nilstrieb

Remove unused args from functions

`#[instrument]` suppresses the unused arguments from a function, *and* suppresses unused methods too! This PR removes things which are only used via `#[instrument]` calls, and fixes some other errors (privacy?) that I will comment inline.

It's possible that some of these arguments were being passed in for the purposes of being instrumented, but I am unconvinced by most of them.

compiler/rustc_hir_analysis/src/astconv/bounds.rs

@@ -243,9 +243,7 @@ impl<'tcx> dyn AstConv<'tcx> + '_ {
         speculative: bool,
         dup_bindings: &mut FxHashMap<DefId, Span>,
         path_span: Span,
-        constness: ty::BoundConstness,
         only_self_bounds: OnlySelfBounds,
-        polarity: ty::ImplPolarity,
     ) -> Result<(), ErrorGuaranteed> {
         // Given something like `U: SomeTrait<T = X>`, we want to produce a
         // predicate like `<U as SomeTrait>::T = X`. This is somewhat

compiler/rustc_hir_analysis/src/astconv/generics.rs

@@ -16,7 +16,7 @@ use rustc_middle::ty::{
     self, GenericArgsRef, GenericParamDef, GenericParamDefKind, IsSuggestable, Ty, TyCtxt,
 };
 use rustc_session::lint::builtin::LATE_BOUND_LIFETIME_ARGUMENTS;
-use rustc_span::{symbol::kw, Span};
+use rustc_span::symbol::kw;
 use smallvec::SmallVec;
 
 /// Report an error that a generic argument did not match the generic parameter that was
@@ -404,7 +404,6 @@ pub fn create_args_for_parent_generic_args<'tcx: 'a, 'a>(
 /// Used specifically for function calls.
 pub fn check_generic_arg_count_for_call(
     tcx: TyCtxt<'_>,
-    span: Span,
     def_id: DefId,
     generics: &ty::Generics,
     seg: &hir::PathSegment<'_>,
@@ -418,17 +417,7 @@ pub fn check_generic_arg_count_for_call(
     };
     let has_self = generics.parent.is_none() && generics.has_self;
 
-    check_generic_arg_count(
-        tcx,
-        span,
-        def_id,
-        seg,
-        generics,
-        gen_args,
-        gen_pos,
-        has_self,
-        seg.infer_args,
-    )
+    check_generic_arg_count(tcx, def_id, seg, generics, gen_args, gen_pos, has_self, seg.infer_args)
 }
 
 /// Checks that the correct number of generic arguments have been provided.
@@ -436,7 +425,6 @@ pub fn check_generic_arg_count_for_call(
 #[instrument(skip(tcx, gen_pos), level = "debug")]
 pub(crate) fn check_generic_arg_count(
     tcx: TyCtxt<'_>,
-    span: Span,
     def_id: DefId,
     seg: &hir::PathSegment<'_>,
     gen_params: &ty::Generics,

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -25,7 +25,7 @@ use rustc_hir as hir;
 use rustc_hir::def::{CtorOf, DefKind, Namespace, Res};
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_hir::intravisit::{walk_generics, Visitor as _};
-use rustc_hir::{GenericArg, GenericArgs, OpaqueTyOrigin};
+use rustc_hir::{GenericArg, GenericArgs};
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
 use rustc_infer::traits::ObligationCause;
 use rustc_middle::middle::stability::AllowUnstable;
@@ -379,7 +379,6 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
 
         let mut arg_count = check_generic_arg_count(
             tcx,
-            span,
             def_id,
             seg,
             generics,
@@ -773,9 +772,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 speculative,
                 &mut dup_bindings,
                 binding.span,
-                constness,
                 only_self_bounds,
-                polarity,
             );
             // Okay to ignore `Err` because of `ErrorGuaranteed` (see above).
         }
@@ -2493,7 +2490,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                 let opaque_ty = tcx.hir().item(item_id);
 
                 match opaque_ty.kind {
-                    hir::ItemKind::OpaqueTy(&hir::OpaqueTy { origin, .. }) => {
+                    hir::ItemKind::OpaqueTy(&hir::OpaqueTy { .. }) => {
                         let local_def_id = item_id.owner_id.def_id;
                         // If this is an RPITIT and we are using the new RPITIT lowering scheme, we
                         // generate the def_id of an associated type for the trait and return as
@@ -2503,7 +2500,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                         } else {
                             local_def_id.to_def_id()
                         };
-                        self.impl_trait_ty_to_ty(def_id, lifetimes, origin, in_trait)
+                        self.impl_trait_ty_to_ty(def_id, lifetimes, in_trait)
                     }
                     ref i => bug!("`impl Trait` pointed to non-opaque type?? {:#?}", i),
                 }
@@ -2559,7 +2556,6 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         &self,
         def_id: DefId,
         lifetimes: &[hir::GenericArg<'_>],
-        origin: OpaqueTyOrigin,
         in_trait: bool,
     ) -> Ty<'tcx> {
         debug!("impl_trait_ty_to_ty(def_id={:?}, lifetimes={:?})", def_id, lifetimes);