propagate tainted_by_errors in MirBorrowckCtxt::emit_errors

compiler/rustc_borrowck/src/lib.rs

@@ -2522,7 +2522,7 @@ mod diags {
         }
 
         pub(crate) fn emit_errors(&mut self) -> Option<ErrorGuaranteed> {
-            let mut res = None;
+            let mut res = self.infcx.tainted_by_errors();
 
             // Buffer any move errors that we collected and de-duplicated.
             for (_, (_, diag)) in std::mem::take(&mut self.diags.buffered_move_errors) {

tests/crashes/126896.rs → tests/ui/polymorphization/taint.rs

@@ -1,6 +1,7 @@
-//@ known-bug: rust-lang/rust#126896
 //@ compile-flags: -Zvalidate-mir -Zinline-mir=yes
 
+// reported as rust-lang/rust#126896
+
 #![feature(type_alias_impl_trait)]
 type Two<'a, 'b> = impl std::fmt::Debug;
 
@@ -13,5 +14,4 @@ fn d(x: Two) {
     c1;
 }
 
-fn main() {
-}
+fn main() {}

tests/ui/polymorphization/taint.stderr

@@ -0,0 +1,12 @@
+error[E0792]: expected generic lifetime parameter, found `'_`
+  --> $DIR/taint.rs:12:17
+   |
+LL | type Two<'a, 'b> = impl std::fmt::Debug;
+   |          -- this generic parameter must be used with a generic lifetime parameter
+...
+LL |     let c1 = || set(x);
+   |                 ^^^^^^
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0792`.

tests/crashes/124164.rs → tests/ui/static/missing-type.rs

@@ -1,4 +1,4 @@
-//@ known-bug: #124164
+// reported as #124164
 static S_COUNT: = std::sync::atomic::AtomicUsize::new(0);
 
 fn main() {}

tests/ui/static/missing-type.stderr

@@ -0,0 +1,8 @@
+error: missing type for `static` item
+  --> $DIR/missing-type.rs:2:16
+   |
+LL | static S_COUNT: = std::sync::atomic::AtomicUsize::new(0);
+   |                ^ help: provide a type for the static variable: `AtomicUsize`
+
+error: aborting due to 1 previous error
+