let new_trait = tcx.mk_dynamic(
ty::Binder(tcx.mk_existential_predicates(iter)), r_b);
let InferOk { obligations, .. } =
- self.infcx.sub_types(false, &obligation.cause, new_trait, target)
+ self.infcx.eq_types(false, &obligation.cause, new_trait, target)
.map_err(|_| Unimplemented)?;
self.inferred_obligations.extend(obligations);
// [T; n] -> [T].
(&ty::TyArray(a, _), &ty::TySlice(b)) => {
let InferOk { obligations, .. } =
- self.infcx.sub_types(false, &obligation.cause, a, b)
+ self.infcx.eq_types(false, &obligation.cause, a, b)
.map_err(|_| Unimplemented)?;
self.inferred_obligations.extend(obligations);
}
});
let new_struct = tcx.mk_adt(def, tcx.mk_substs(params));
let InferOk { obligations, .. } =
- self.infcx.sub_types(false, &obligation.cause, new_struct, target)
+ self.infcx.eq_types(false, &obligation.cause, new_struct, target)
.map_err(|_| Unimplemented)?;
self.inferred_obligations.extend(obligations);
--- /dev/null
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn prove_static<T: 'static + ?Sized>(_: &'static T) {}
+
+fn lifetime_transmute_slice<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T {
+ let mut out = [x];
+ //~^ ERROR cannot infer an appropriate lifetime due to conflicting requirements
+ {
+ let slice: &mut [_] = &mut out;
+ slice[0] = y;
+ }
+ out[0]
+}
+
+struct Struct<T, U: ?Sized> {
+ head: T,
+ _tail: U
+}
+
+fn lifetime_transmute_struct<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T {
+ let mut out = Struct { head: x, _tail: [()] };
+ //~^ ERROR cannot infer an appropriate lifetime due to conflicting requirements
+ {
+ let dst: &mut Struct<_, [()]> = &mut out;
+ dst.head = y;
+ }
+ out.head
+}
+
+fn main() {
+ prove_static(lifetime_transmute_slice("", &String::from("foo")));
+ prove_static(lifetime_transmute_struct("", &String::from("bar")));
+}
--- /dev/null
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn save_ref<'a>(refr: &'a i32, to: &mut [&'a i32]) {
+ for val in &mut *to {
+ *val = refr;
+ }
+}
+
+fn main() {
+ let ref init = 0i32;
+ let ref mut refr = 1i32;
+
+ let mut out = [init];
+
+ save_ref(&*refr, &mut out);
+
+ // This shouldn't be allowed as `refr` is borrowed
+ *refr = 3; //~ ERROR cannot assign to `*refr` because it is borrowed
+
+ // Prints 3?!
+ println!("{:?}", out[0]);
+}