Remove has_errors from FnCtxt

compiler/rustc_hir_typeck/src/expr.rs

@@ -220,7 +220,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Hide the outer diverging and has_errors flags.
         let old_diverges = self.diverges.replace(Diverges::Maybe);
-        let old_has_errors = self.has_errors.replace(false);
 
         let ty = ensure_sufficient_stack(|| match &expr.kind {
             hir::ExprKind::Path(
@@ -259,7 +258,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Combine the diverging and has_error flags.
         self.diverges.set(self.diverges.get() | old_diverges);
-        self.has_errors.set(self.has_errors.get() | old_has_errors);
 
         debug!("type of {} is...", self.tcx.hir().node_to_string(expr.hir_id));
         debug!("... {:?}, expected is {:?}", ty, expected);

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -143,7 +143,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         self.typeck_results.borrow_mut().node_types_mut().insert(id, ty);
 
         if ty.references_error() {
-            self.has_errors.set(true);
             self.set_tainted_by_errors();
         }
     }

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -1334,7 +1334,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Hide the outer diverging and `has_errors` flags.
         let old_diverges = self.diverges.replace(Diverges::Maybe);
-        let old_has_errors = self.has_errors.replace(false);
 
         match stmt.kind {
             hir::StmtKind::Local(l) => {
@@ -1364,7 +1363,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Combine the diverging and `has_error` flags.
         self.diverges.set(self.diverges.get() | old_diverges);
-        self.has_errors.set(self.has_errors.get() | old_has_errors);
     }
 
     pub fn check_block_no_value(&self, blk: &'tcx hir::Block<'tcx>) {
@@ -1544,11 +1542,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             self.diverges.set(prev_diverges);
         }
 
-        let mut ty = ctxt.coerce.unwrap().complete(self);
-
-        if self.has_errors.get() || ty.references_error() {
-            ty = self.tcx.ty_error()
-        }
+        let ty = ctxt.coerce.unwrap().complete(self);
 
         self.write_ty(blk.hir_id, ty);
 

compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs

@@ -112,9 +112,6 @@ pub struct FnCtxt<'a, 'tcx> {
     /// the diverges flag is set to something other than `Maybe`.
     pub(super) diverges: Cell<Diverges>,
 
-    /// Whether any child nodes have any type errors.
-    pub(super) has_errors: Cell<bool>,
-
     pub(super) enclosing_breakables: RefCell<EnclosingBreakables<'tcx>>,
 
     pub(super) inh: &'a Inherited<'tcx>,
@@ -145,7 +142,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             resume_yield_tys: None,
             ps: Cell::new(UnsafetyState::function(hir::Unsafety::Normal, hir::CRATE_HIR_ID)),
             diverges: Cell::new(Diverges::Maybe),
-            has_errors: Cell::new(false),
             enclosing_breakables: RefCell::new(EnclosingBreakables {
                 stack: Vec::new(),
                 by_id: Default::default(),

src/test/ui/error-codes/E0767.rs

@@ -1,6 +1,7 @@
-fn main () {
+fn main() {
     'a: loop {
         || {
+            //~^ ERROR mismatched types
             loop { break 'a; } //~ ERROR E0767
         }
     }

src/test/ui/error-codes/E0767.stderr

@@ -1,14 +1,27 @@
 error[E0767]: use of unreachable label `'a`
-  --> $DIR/E0767.rs:4:26
+  --> $DIR/E0767.rs:5:26
    |
 LL |     'a: loop {
    |     -- unreachable label defined here
-LL |         || {
+...
 LL |             loop { break 'a; }
    |                          ^^ unreachable label `'a`
    |
    = note: labels are unreachable through functions, closures, async blocks and modules
 
-error: aborting due to previous error
+error[E0308]: mismatched types
+  --> $DIR/E0767.rs:3:9
+   |
+LL | /         || {
+LL | |
+LL | |             loop { break 'a; }
+LL | |         }
+   | |_________^ expected `()`, found closure
+   |
+   = note: expected unit type `()`
+                found closure `[closure@$DIR/E0767.rs:3:9: 3:11]`
+
+error: aborting due to 2 previous errors
 
-For more information about this error, try `rustc --explain E0767`.
+Some errors have detailed explanations: E0308, E0767.
+For more information about an error, try `rustc --explain E0308`.