From 77dae2d25d900a8e7493c548498cdc94bdcee3d9 Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Sun, 6 Feb 2022 12:16:49 -0800
Subject: [PATCH] skip const eval if we have an error in borrowck

---
 .../src/const_eval/eval_queries.rs                |  3 +++
 .../src/interpret/eval_context.rs                 |  6 +++++-
 compiler/rustc_middle/src/ty/context.rs           | 15 ++++++++++++++-
 3 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/compiler/rustc_const_eval/src/const_eval/eval_queries.rs b/compiler/rustc_const_eval/src/const_eval/eval_queries.rs
index 9dc34260de7..7235b8416ad 100644
--- a/compiler/rustc_const_eval/src/const_eval/eval_queries.rs
+++ b/compiler/rustc_const_eval/src/const_eval/eval_queries.rs
@@ -287,6 +287,9 @@ pub fn eval_to_allocation_raw_provider<'tcx>(
             if let Some(error_reported) = tcx.typeck_opt_const_arg(def).tainted_by_errors {
                 return Err(ErrorHandled::Reported(error_reported));
             }
+            if tcx.mir_borrowck_opt_const_arg(def).tainted_by_errors {
+                return Err(ErrorHandled::Reported(ErrorReported {}));
+            }
         }
         if !tcx.is_mir_available(def.did) {
             tcx.sess.delay_span_bug(
diff --git a/compiler/rustc_const_eval/src/interpret/eval_context.rs b/compiler/rustc_const_eval/src/interpret/eval_context.rs
index 0a8112da2ab..00c066a2851 100644
--- a/compiler/rustc_const_eval/src/interpret/eval_context.rs
+++ b/compiler/rustc_const_eval/src/interpret/eval_context.rs
@@ -514,10 +514,14 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         if let Some(def) = def.as_local() {
             if self.tcx.has_typeck_results(def.did) {
                 if let Some(error_reported) = self.tcx.typeck_opt_const_arg(def).tainted_by_errors {
-                    throw_inval!(AlreadyReported(error_reported))
+                    throw_inval!(AlreadyReported(error_reported));
+                }
+                if self.tcx.mir_borrowck_opt_const_arg(def).tainted_by_errors {
+                    throw_inval!(AlreadyReported(rustc_errors::ErrorReported {}));
                 }
             }
         }
+
         trace!("load mir(instance={:?}, promoted={:?})", instance, promoted);
         if let Some(promoted) = promoted {
             return Ok(&self.tcx.promoted_mir_opt_const_arg(def)[promoted]);
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index a119655a90b..4a3efb5c1b8 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -8,7 +8,9 @@ use crate::lint::{struct_lint_level, LintDiagnosticBuilder, LintLevelSource};
 use crate::middle::resolve_lifetime::{self, LifetimeScopeForPath};
 use crate::middle::stability;
 use crate::mir::interpret::{self, Allocation, ConstValue, Scalar};
-use crate::mir::{Body, Field, Local, Place, PlaceElem, ProjectionKind, Promoted};
+use crate::mir::{
+    Body, BorrowCheckResult, Field, Local, Place, PlaceElem, ProjectionKind, Promoted,
+};
 use crate::thir::Thir;
 use crate::traits;
 use crate::ty::query::{self, TyCtxtAt};
@@ -1061,6 +1063,17 @@ impl<'tcx> TyCtxt<'tcx> {
         }
     }
 
+    pub fn mir_borrowck_opt_const_arg(
+        self,
+        def: ty::WithOptConstParam<LocalDefId>,
+    ) -> &'tcx BorrowCheckResult<'tcx> {
+        if let Some(param_did) = def.const_param_did {
+            self.mir_borrowck_const_arg((def.did, param_did))
+        } else {
+            self.mir_borrowck(def.did)
+        }
+    }
+
     pub fn alloc_steal_thir(self, thir: Thir<'tcx>) -> &'tcx Steal<Thir<'tcx>> {
         self.arena.alloc(Steal::new(thir))
     }