Remove DefId from EarlyParamRegion (tedium/diagnostics)

compiler/rustc_infer/src/errors/mod.rs

@@ -5,6 +5,7 @@ use rustc_errors::{
     MultiSpan, SubdiagMessageOp, Subdiagnostic,
 };
 use rustc_hir as hir;
+use rustc_hir::def_id::LocalDefId;
 use rustc_hir::intravisit::{walk_ty, Visitor};
 use rustc_hir::FnRetTy;
 use rustc_macros::{Diagnostic, Subdiagnostic};
@@ -344,6 +345,7 @@ impl Subdiagnostic for LifetimeMismatchLabels {
 
 pub struct AddLifetimeParamsSuggestion<'a> {
     pub tcx: TyCtxt<'a>,
+    pub generic_param_scope: LocalDefId,
     pub sub: Region<'a>,
     pub ty_sup: &'a hir::Ty<'a>,
     pub ty_sub: &'a hir::Ty<'a>,
@@ -357,7 +359,8 @@ impl Subdiagnostic for AddLifetimeParamsSuggestion<'_> {
         _f: &F,
     ) {
         let mut mk_suggestion = || {
-            let Some(anon_reg) = self.tcx.is_suitable_region(self.sub) else {
+            let Some(anon_reg) = self.tcx.is_suitable_region(self.generic_param_scope, self.sub)
+            else {
                 return false;
             };
 

compiler/rustc_infer/src/errors/note_and_explain.rs

@@ -1,6 +1,7 @@
 use crate::fluent_generated as fluent;
 use crate::infer::error_reporting::nice_region_error::find_anon_type;
 use rustc_errors::{Diag, EmissionGuarantee, IntoDiagArg, SubdiagMessageOp, Subdiagnostic};
+use rustc_hir::def_id::LocalDefId;
 use rustc_middle::bug;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_span::{symbol::kw, Span};
@@ -14,12 +15,15 @@ struct DescriptionCtx<'a> {
 impl<'a> DescriptionCtx<'a> {
     fn new<'tcx>(
         tcx: TyCtxt<'tcx>,
+        generic_param_scope: LocalDefId,
         region: ty::Region<'tcx>,
         alt_span: Option<Span>,
     ) -> Option<Self> {
         let (span, kind, arg) = match *region {
-            ty::ReEarlyParam(ref br) => {
-                let scope = region.free_region_binding_scope(tcx).expect_local();
+            ty::ReEarlyParam(br) => {
+                let scope = tcx
+                    .parent(tcx.generics_of(generic_param_scope).region_param(br, tcx).def_id)
+                    .expect_local();
                 let span = if let Some(param) =
                     tcx.hir().get_generics(scope).and_then(|generics| generics.get_named(br.name))
                 {
@@ -35,11 +39,12 @@ impl<'a> DescriptionCtx<'a> {
             }
             ty::ReLateParam(ref fr) => {
                 if !fr.bound_region.is_named()
-                    && let Some((ty, _)) = find_anon_type(tcx, region, &fr.bound_region)
+                    && let Some((ty, _)) =
+                        find_anon_type(tcx, generic_param_scope, region, &fr.bound_region)
                 {
                     (Some(ty.span), "defined_here", String::new())
                 } else {
-                    let scope = region.free_region_binding_scope(tcx).expect_local();
+                    let scope = fr.scope.expect_local();
                     match fr.bound_region {
                         ty::BoundRegionKind::BrNamed(_, name) => {
                             let span = if let Some(param) = tcx
@@ -143,12 +148,17 @@ pub struct RegionExplanation<'a> {
 impl RegionExplanation<'_> {
     pub fn new<'tcx>(
         tcx: TyCtxt<'tcx>,
+        generic_param_scope: LocalDefId,
         region: ty::Region<'tcx>,
         alt_span: Option<Span>,
         prefix: PrefixKind,
         suffix: SuffixKind,
     ) -> Option<Self> {
-        Some(Self { desc: DescriptionCtx::new(tcx, region, alt_span)?, prefix, suffix })
+        Some(Self {
+            desc: DescriptionCtx::new(tcx, generic_param_scope, region, alt_span)?,
+            prefix,
+            suffix,
+        })
     }
 }