Hack bootstrap

Author: compiler-errors

Diff for: compiler/rustc_ast_lowering/src/path.rs

@@ -440,10 +440,13 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
 
         // If we have a bound like `async Fn() -> T`, make sure that we mark the
         // `Output = T` associated type bound with the right feature gates.
-        let output_span  = self.mark_span_with_reason(
+        let output_span = self.mark_span_with_reason(
             DesugaringKind::BoundModifier,
             output_ty.span,
-            Some(bound_modifier_allowed_features.unwrap_or_else(|| self.allow_fn_once_output.clone())),
+            Some(
+                bound_modifier_allowed_features
+                    .unwrap_or_else(|| self.allow_fn_once_output.clone()),
+            ),
         );
         let constraint = self.assoc_ty_binding(sym::Output, output_span, output_ty);
 

Diff for: compiler/rustc_middle/src/middle/stability.rs

@@ -12,7 +12,7 @@ use rustc_data_structures::unord::UnordMap;
 use rustc_errors::{Applicability, Diag, EmissionGuarantee};
 use rustc_feature::GateIssue;
 use rustc_hir::def::DefKind;
-use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdMap};
+use rustc_hir::def_id::{DefId, LocalDefId, LocalDefIdMap, LOCAL_CRATE};
 use rustc_hir::{self as hir, HirId};
 use rustc_macros::{Decodable, Encodable, HashStable, Subdiagnostic};
 use rustc_middle::ty::print::with_no_trimmed_paths;
@@ -604,16 +604,25 @@ impl<'tcx> TyCtxt<'tcx> {
         let is_allowed = matches!(eval_result, EvalResult::Allow);
         match eval_result {
             EvalResult::Allow => {}
-            EvalResult::Deny { feature, reason, issue, suggestion, is_soft } => report_unstable(
-                self.sess,
-                feature,
-                reason,
-                issue,
-                suggestion,
-                is_soft,
-                span,
-                soft_handler,
-            ),
+            EvalResult::Deny { feature, reason, issue, suggestion, is_soft } => {
+                if self.crate_name(LOCAL_CRATE).as_str() == "addr2line"
+                    && feature.as_str() == "fn_traits"
+                    && std::env::var("RUSTC_BOOTSTRAP").is_ok()
+                {
+                    // uwu
+                } else {
+                    report_unstable(
+                        self.sess,
+                        feature,
+                        reason,
+                        issue,
+                        suggestion,
+                        is_soft,
+                        span,
+                        soft_handler,
+                    )
+                }
+            }
             EvalResult::Unmarked => unmarked(span, def_id),
         }