Auto merge of rust-lang#17551 - Veykril:has-errors, r=Veykril

Also mark InferenceResult::has_errors flag when there are error types

Should work around rust-lang/rust-analyzer#15090 (comment)

Author: bors

src/tools/rust-analyzer/crates/hir-ty/src/infer.rs

@@ -701,18 +701,23 @@ impl<'a> InferenceContext<'a> {
         table.propagate_diverging_flag();
         for ty in type_of_expr.values_mut() {
             *ty = table.resolve_completely(ty.clone());
+            *has_errors = *has_errors || ty.contains_unknown();
         }
         for ty in type_of_pat.values_mut() {
             *ty = table.resolve_completely(ty.clone());
+            *has_errors = *has_errors || ty.contains_unknown();
         }
         for ty in type_of_binding.values_mut() {
             *ty = table.resolve_completely(ty.clone());
+            *has_errors = *has_errors || ty.contains_unknown();
         }
         for ty in type_of_rpit.values_mut() {
             *ty = table.resolve_completely(ty.clone());
+            *has_errors = *has_errors || ty.contains_unknown();
         }
         for ty in type_of_for_iterator.values_mut() {
             *ty = table.resolve_completely(ty.clone());
+            *has_errors = *has_errors || ty.contains_unknown();
         }
 
         *has_errors = !type_mismatches.is_empty();

src/tools/rust-analyzer/crates/hir-ty/src/mir/lower.rs

@@ -2160,9 +2160,7 @@ pub fn lower_to_mir(
     root_expr: ExprId,
 ) -> Result<MirBody> {
     if infer.has_errors {
-        return Err(MirLowerError::TypeMismatch(
-            infer.type_mismatches().next().map(|(_, it)| it.clone()),
-        ));
+        return Err(MirLowerError::TypeMismatch(None));
     }
     let mut ctx = MirLowerCtx::new(db, owner, body, infer);
     // 0 is return local