Rollup merge of #105837 - compiler-errors:issue-105728, r=estebank

Don't ICE in `check_must_not_suspend_ty` for mismatched tuple arity

These expressions are just used for their spans, so make it best-effort here.

Fixes #105728

2 files changed, 21 insertions, 0 deletions

diff --git a/src/test/ui/lint/must_not_suspend/tuple-mismatch.rs b/src/test/ui/lint/must_not_suspend/tuple-mismatch.rs
new file mode 100644
index 00000000000..c7e14e42561
--- /dev/null
+++ b/src/test/ui/lint/must_not_suspend/tuple-mismatch.rs
@@ -0,0 +1,9 @@
+#![feature(generators)]
+
+fn main() {
+    let _generator = || {
+        yield ((), ((), ()));
+        yield ((), ());
+        //~^ ERROR mismatched types
+    };
+}
diff --git a/src/test/ui/lint/must_not_suspend/tuple-mismatch.stderr b/src/test/ui/lint/must_not_suspend/tuple-mismatch.stderr
new file mode 100644
index 00000000000..cca8cd9bd89
--- /dev/null
+++ b/src/test/ui/lint/must_not_suspend/tuple-mismatch.stderr
@@ -0,0 +1,12 @@
+error[E0308]: mismatched types
+  --> $DIR/tuple-mismatch.rs:6:20
+   |
+LL |         yield ((), ());
+   |                    ^^ expected tuple, found `()`
+   |
+   = note:  expected tuple `((), ())`
+           found unit type `()`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.