Rollup merge of #96379 - PrestonFrom:issue_96335, r=compiler-errors

delay bug when adjusting `NeverToAny` twice during diagnostic code

Addresses Issue 96335 (https://github.com/rust-lang/rust/issues/96335) by using `delay_span_bug` instead of an assert and returning an error type from `check_expr_meets_expectation_or_error`.

Fixes #96335

compiler/rustc_typeck/src/check/expr.rs

@@ -78,10 +78,18 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // While we don't allow *arbitrary* coercions here, we *do* allow
         // coercions from ! to `expected`.
         if ty.is_never() {
-            assert!(
+            if let Some(adjustments) = self.typeck_results.borrow().adjustments().get(expr.hir_id) {
-                !self.typeck_results.borrow().adjustments().contains_key(expr.hir_id),
+                self.tcx().sess.delay_span_bug(
-                "expression with never type wound up being adjusted"
+                    expr.span,
-            );
+                    "expression with never type wound up being adjusted",
+                );
+                return if let [Adjustment { kind: Adjust::NeverToAny, target }] = &adjustments[..] {
+                    target.to_owned()
+                } else {
+                    self.tcx().ty_error()
+                };
+            }
+
             let adj_ty = self.next_ty_var(TypeVariableOrigin {
                 kind: TypeVariableOriginKind::AdjustmentType,
                 span: expr.span,

src/test/ui/never_type/issue-96335.rs

@@ -0,0 +1,5 @@
+fn main() {
+    0.....{loop{}1};
+    //~^ ERROR unexpected token
+    //~| ERROR mismatched types
+}

src/test/ui/never_type/issue-96335.stderr

@@ -0,0 +1,35 @@
+error: unexpected token: `...`
+  --> $DIR/issue-96335.rs:2:6
+   |
+LL |     0.....{loop{}1};
+   |      ^^^
+   |
+help: use `..` for an exclusive range
+   |
+LL |     0....{loop{}1};
+   |      ~~
+help: or `..=` for an inclusive range
+   |
+LL |     0..=..{loop{}1};
+   |      ~~~
+
+error[E0308]: mismatched types
+  --> $DIR/issue-96335.rs:2:9
+   |
+LL |     0.....{loop{}1};
+   |     ----^^^^^^^^^^^
+   |     |   |
+   |     |   expected integer, found struct `RangeTo`
+   |     arguments to this function are incorrect
+   |
+   = note: expected type `{integer}`
+            found struct `RangeTo<{integer}>`
+note: associated function defined here
+  --> $SRC_DIR/core/src/ops/range.rs:LL:COL
+   |
+LL |     pub const fn new(start: Idx, end: Idx) -> Self {
+   |                  ^^^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.