rename is_tainted_by_errors

compiler/rustc_borrowck/src/lib.rs

@@ -2294,9 +2294,13 @@ mod error {
         }
 
         pub fn buffer_error(&mut self, t: DiagnosticBuilder<'_, ErrorGuaranteed>) {
-            self.tainted_by_errors = Some(
+            if let None = self.tainted_by_errors {
-                self.tcx.sess.delay_span_bug(t.span.clone(), "diagnostic buffered but not emitted"),
+                self.tainted_by_errors = Some(
-            );
+                    self.tcx
+                        .sess
+                        .delay_span_bug(t.span.clone(), "diagnostic buffered but not emitted"),
+                )
+            }
             t.buffer(&mut self.buffered);
         }
 

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -219,7 +219,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
         instantiated_ty: OpaqueHiddenType<'tcx>,
         origin: OpaqueTyOrigin,
     ) -> Ty<'tcx> {
-        if let Some(e) = self.is_tainted_by_errors() {
+        if let Some(e) = self.tainted_by_errors() {
             return self.tcx.ty_error_with_guaranteed(e);
         }
 

compiler/rustc_hir_typeck/src/fallback.rs

@@ -104,7 +104,7 @@ impl<'tcx> FnCtxt<'_, 'tcx> {
         // type, `?T` is not considered unsolved, but `?I` is. The
         // same is true for float variables.)
         let fallback = match ty.kind() {
-            _ if let Some(e) = self.is_tainted_by_errors() => self.tcx.ty_error_with_guaranteed(e),
+            _ if let Some(e) = self.tainted_by_errors() => self.tcx.ty_error_with_guaranteed(e),
             ty::Infer(ty::IntVar(_)) => self.tcx.types.i32,
             ty::Infer(ty::FloatVar(_)) => self.tcx.types.f64,
             _ => match diverging_fallback.get(&ty) {

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -528,7 +528,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     pub fn node_ty(&self, id: hir::HirId) -> Ty<'tcx> {
         match self.typeck_results.borrow().node_types().get(id) {
             Some(&t) => t,
-            None if let Some(e) = self.is_tainted_by_errors() => self.tcx.ty_error_with_guaranteed(e),
+            None if let Some(e) = self.tainted_by_errors() => self.tcx.ty_error_with_guaranteed(e),
             None => {
                 bug!(
                     "no type for node {}: {} in fcx {}",
@@ -543,7 +543,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     pub fn node_ty_opt(&self, id: hir::HirId) -> Option<Ty<'tcx>> {
         match self.typeck_results.borrow().node_types().get(id) {
             Some(&t) => Some(t),
-            None if let Some(e) = self.is_tainted_by_errors() => Some(self.tcx.ty_error_with_guaranteed(e)),
+            None if let Some(e) = self.tainted_by_errors() => Some(self.tcx.ty_error_with_guaranteed(e)),
             None => None,
         }
     }
@@ -1440,7 +1440,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         if !ty.is_ty_var() {
             ty
         } else {
-            if let None = self.is_tainted_by_errors() {
+            if let None = self.tainted_by_errors() {
                 self.err_ctxt()
                     .emit_inference_failure_err((**self).body_id, sp, ty.into(), E0282, true)
                     .emit();

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -73,6 +73,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let ty = self.typeck_results.borrow().expr_ty_adjusted(expr);
                 let ty = self.resolve_vars_if_possible(ty);
                 if ty.has_non_region_infer() {
+                    assert!(self.tainted_by_errors().is_some());
                     self.tcx.ty_error()
                 } else {
                     self.tcx.erase_regions(ty)

compiler/rustc_hir_typeck/src/lib.rs

@@ -344,7 +344,7 @@ fn typeck_with_fallback<'tcx>(
 
         fcx.select_all_obligations_or_error();
 
-        if let None = fcx.infcx.is_tainted_by_errors() {
+        if let None = fcx.infcx.tainted_by_errors() {
             fcx.check_transmutes();
         }
 

compiler/rustc_hir_typeck/src/mem_categorization.rs

@@ -133,7 +133,7 @@ impl<'a, 'tcx> MemCategorizationContext<'a, 'tcx> {
     }
 
     fn is_tainted_by_errors(&self) -> bool {
-        self.infcx.is_tainted_by_errors().is_some()
+        self.infcx.tainted_by_errors().is_some()
     }
 
     fn resolve_type_vars_or_error(

compiler/rustc_hir_typeck/src/writeback.rs

@@ -83,7 +83,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         wbcx.typeck_results.treat_byte_string_as_slice =
             mem::take(&mut self.typeck_results.borrow_mut().treat_byte_string_as_slice);
 
-        if let Some(e) = self.is_tainted_by_errors() {
+        if let Some(e) = self.tainted_by_errors() {
             wbcx.typeck_results.tainted_by_errors = Some(e);
         }
 
@@ -673,7 +673,6 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
         // to mark the `TypeckResults` as tainted in that case, so that downstream
         // users of the typeck results don't produce extra errors, or worse, ICEs.
         if let Some(e) = resolver.replaced_with_error {
-            // FIXME(eddyb) keep track of `ErrorGuaranteed` from where the error was emitted.
             self.typeck_results.tainted_by_errors = Some(e);
         }
 

compiler/rustc_infer/src/infer/mod.rs

@@ -1208,7 +1208,8 @@ impl<'tcx> InferCtxt<'tcx> {
     /// reporting errors that often occur as a result of earlier
     /// errors, but where it's hard to be 100% sure (e.g., unresolved
     /// inference variables, regionck errors).
-    pub fn is_tainted_by_errors(&self) -> Option<ErrorGuaranteed> {
+    #[must_use = "this method does not have any side effects"]
+    pub fn tainted_by_errors(&self) -> Option<ErrorGuaranteed> {
         debug!(
             "is_tainted_by_errors(err_count={}, err_count_on_creation={}, \
              tainted_by_errors={})",
@@ -1217,14 +1218,17 @@ impl<'tcx> InferCtxt<'tcx> {
             self.tainted_by_errors.get().is_some()
         );
 
+        if let Some(e) = self.tainted_by_errors.get() {
+            return Some(e);
+        }
+
         if self.tcx.sess.err_count() > self.err_count_on_creation {
             // errors reported since this infcx was made
-            return Some(self.tcx.sess.delay_span_bug(
+            self.set_tainted_by_errors();
-                DUMMY_SP,
+            return self.tainted_by_errors.get();
-                "`tcx.sess.error_count()` incorrectly returned non zero value",
-            ));
         }
-        self.tainted_by_errors.get()
+
+        None
     }
 
     /// Set the "tainted by errors" flag to true. We call this when we
@@ -1274,7 +1278,7 @@ impl<'tcx> InferCtxt<'tcx> {
             let mut inner = self.inner.borrow_mut();
             let inner = &mut *inner;
             assert!(
-                self.is_tainted_by_errors().is_some() || inner.region_obligations.is_empty(),
+                self.tainted_by_errors().is_some() || inner.region_obligations.is_empty(),
                 "region_obligations not empty: {:#?}",
                 inner.region_obligations
             );
@@ -1711,7 +1715,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
     ) {
         let errors = self.resolve_regions(outlives_env);
 
-        if let None = self.is_tainted_by_errors() {
+        if let None = self.tainted_by_errors() {
             // As a heuristic, just skip reporting region errors
             // altogether if other errors have been reported while
             // this infcx was in use.  This is totally hokey but

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

@@ -2060,7 +2060,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 // check upstream for type errors and don't add the obligations to
                 // begin with in those cases.
                 if self.tcx.lang_items().sized_trait() == Some(trait_ref.def_id()) {
-                    if let None = self.is_tainted_by_errors() {
+                    if let None = self.tainted_by_errors() {
                         self.emit_inference_failure_err(
                             body_id,
                             span,
@@ -2115,14 +2115,16 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                         if impls.len() > 1 && impls.len() < 5 && has_non_region_infer {
                             self.annotate_source_of_ambiguity(&mut err, &impls, predicate);
                         } else {
-                            if self.is_tainted_by_errors().is_some() {
+                            if self.tainted_by_errors().is_some() {
+                                err.cancel();
                                 return;
                             }
                             err.note(&format!("cannot satisfy `{}`", predicate));
                         }
                     }
                     _ => {
-                        if self.is_tainted_by_errors().is_some() {
+                        if self.tainted_by_errors().is_some() {
+                            err.cancel();
                             return;
                         }
                         err.note(&format!("cannot satisfy `{}`", predicate));
@@ -2224,7 +2226,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                         ] = path.segments
                         && data.trait_ref.def_id == *trait_id
                         && self.tcx.trait_of_item(*item_id) == Some(*trait_id)
-                        && let None = self.is_tainted_by_errors()
+                        && let None = self.tainted_by_errors()
                     {
                         let (verb, noun) = match self.tcx.associated_item(item_id).kind {
                             ty::AssocKind::Const => ("refer to the", "constant"),
@@ -2293,7 +2295,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 // with error messages.
                 if arg.references_error()
                     || self.tcx.sess.has_errors().is_some()
-                    || self.is_tainted_by_errors().is_some()
+                    || self.tainted_by_errors().is_some()
                 {
                     return;
                 }
@@ -2304,7 +2306,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             ty::PredicateKind::Subtype(data) => {
                 if data.references_error()
                     || self.tcx.sess.has_errors().is_some()
-                    || self.is_tainted_by_errors().is_some()
+                    || self.tainted_by_errors().is_some()
                 {
                     // no need to overload user in such cases
                     return;
@@ -2315,7 +2317,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 self.emit_inference_failure_err(body_id, span, a.into(), ErrorCode::E0282, true)
             }
             ty::PredicateKind::Projection(data) => {
-                if predicate.references_error() || self.is_tainted_by_errors().is_some() {
+                if predicate.references_error() || self.tainted_by_errors().is_some() {
                     return;
                 }
                 let subst = data
@@ -2349,7 +2351,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             }
 
             ty::PredicateKind::ConstEvaluatable(data) => {
-                if predicate.references_error() || self.is_tainted_by_errors().is_some() {
+                if predicate.references_error() || self.tainted_by_errors().is_some() {
                     return;
                 }
                 let subst = data.walk().find(|g| g.is_non_region_infer());
@@ -2376,7 +2378,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                 }
             }
             _ => {
-                if self.tcx.sess.has_errors().is_some() || self.is_tainted_by_errors().is_some() {
+                if self.tcx.sess.has_errors().is_some() || self.tainted_by_errors().is_some() {
                     return;
                 }
                 let mut err = struct_span_err!(
@@ -2420,7 +2422,7 @@ impl<'tcx> InferCtxtPrivExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
         post.sort();
         post.dedup();
 
-        if self.is_tainted_by_errors().is_some()
+        if self.tainted_by_errors().is_some()
             && (crate_names.len() == 1
                 && spans.len() == 0
                 && ["`core`", "`alloc`", "`std`"].contains(&crate_names[0].as_str())

compiler/rustc_trait_selection/src/traits/select/mod.rs

@@ -1089,7 +1089,7 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
         if !self.infcx.tcx.recursion_limit().value_within_limit(depth) {
             match self.query_mode {
                 TraitQueryMode::Standard => {
-                    if let Some(e) = self.infcx.is_tainted_by_errors() {
+                    if let Some(e) = self.infcx.tainted_by_errors() {
                         return Err(OverflowError::Error(e));
                     }
                     self.infcx.err_ctxt().report_overflow_error(error_obligation, true);

src/test/ui/issues/issue-52262.rs

@@ -1,4 +1,3 @@
-// compile-flags:-Ztreat-err-as-bug=5
 #[derive(Debug)]
 enum MyError {
     NotFound { key: Vec<u8> },

src/test/ui/issues/issue-52262.stderr

@@ -1,5 +1,5 @@
 error[E0507]: cannot move out of `*key` which is behind a shared reference
-  --> $DIR/issue-52262.rs:16:35
+  --> $DIR/issue-52262.rs:15:35
    |
 LL |                 String::from_utf8(*key).unwrap()
    |                                   ^^^^ move occurs because `*key` has type `Vec<u8>`, which does not implement the `Copy` trait