//
// Note: in fact we only permit builtin traits, not `Bar<'d>`, I
// am looking forward to the future here.
-
- if !data.has_escaping_bound_vars() {
+ if !data.has_escaping_bound_vars() && !region.has_escaping_bound_vars() {
let implicit_bounds =
object_region_bounds(self.infcx.tcx, data);
--- /dev/null
+// A variant of #53548 that does not actually require generators,
+// but which encountered the same ICE/error. See `issue-53548.rs`
+// for details.
+//
+// compile-pass
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+trait Trait: 'static {}
+
+struct Store<C> {
+ inner: Rc<RefCell<Option<C>>>,
+}
+
+fn main() {
+ let store = Store::<Box<for<'a> fn(&(dyn Trait + 'a))>> {
+ inner: Default::default(),
+ };
+}
--- /dev/null
+// Regression test for #53548. The `Box<dyn Trait>` type below is
+// expanded to `Box<dyn Trait + 'static>`, but the generator "witness"
+// that results is `for<'r> { Box<dyn Trait + 'r> }`. The WF code was
+// encountering an ICE (when debug-assertions were enabled) and an
+// unexpected compilation error (without debug-asserions) when trying
+// to process this `'r` region bound. In particular, to be WF, the
+// region bound must meet the requirements of the trait, and hence we
+// got `for<'r> { 'r: 'static }`. This would ICE because the `Binder`
+// constructor we were using was assering that no higher-ranked
+// regions were involved (because the WF code is supposed to skip
+// those). The error (if debug-asserions were disabled) came because
+// we obviously cannot prove that `'r: 'static` for any region `'r`.
+// Pursuant with our "lazy WF" strategy for higher-ranked regions, the
+// fix is not to require that `for<'r> { 'r: 'static }` holds (this is
+// also analogous to what we would do for higher-ranked regions
+// appearing within the trait in other positions).
+//
+// compile-pass
+
+#![feature(generators)]
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+trait Trait: 'static {}
+
+struct Store<C> {
+ inner: Rc<RefCell<Option<C>>>,
+}
+
+fn main() {
+ Box::new(static move || {
+ let store = Store::<Box<dyn Trait>> {
+ inner: Default::default(),
+ };
+ yield ();
+ });
+}
+