// option. This file may not be copied, modified, or distributed
// except according to those terms.
-// check that static methods don't get to assume `Self` is well-formed
+// check that static methods don't get to assume their trait-ref
+// is well-formed.
+// FIXME(#27579): this is just a bug. However, our checking with
+// static inherent methods isn't quite working - need to
+// fix that before removing the check.
-trait Foo<'a, 'b>: Sized {
+trait Foo<'a, 'b, T>: Sized {
fn make_me() -> Self { loop {} }
- fn static_evil(u: &'a u32) -> &'b u32;
+ fn static_evil(u: &'b u32) -> &'a u32;
}
struct Evil<'a, 'b: 'a>(Option<&'a &'b ()>);
-impl<'a, 'b> Foo<'a, 'b> for Evil<'a, 'b> {
- fn make_me() -> Self { Evil(None) }
- fn static_evil(u: &'a u32) -> &'b u32 {
+impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
+ fn make_me() -> Self { }
+ fn static_evil(u: &'b u32) -> &'a u32 {
u //~ ERROR cannot infer an appropriate lifetime
}
}
struct IndirectEvil<'a, 'b: 'a>(Option<&'a &'b ()>);
-impl<'a, 'b> Foo<'a, 'b> for IndirectEvil<'a, 'b> {
+impl<'a, 'b> Foo<'a, 'b, ()> for IndirectEvil<'a, 'b> {
fn make_me() -> Self { IndirectEvil(None) }
- fn static_evil(u: &'a u32) -> &'b u32 {
+ fn static_evil(u: &'b u32) -> &'a u32 {
let me = Self::make_me(); //~ ERROR lifetime bound not satisfied
loop {} // (`me` could be used for the lifetime transmute).
}
}
+impl<'a, 'b> Evil<'a, 'b> {
+ fn inherent_evil(u: &'b u32) -> &'a u32 {
+ u //~ ERROR cannot infer an appropriate lifetime
+ }
+}
+
+// while static methods don't get to *assume* this, we still
+// *check* that they hold.
+
+fn evil<'a, 'b>(b: &'b u32) -> &'a u32 {
+ <()>::static_evil(b) //~ ERROR cannot infer an appropriate lifetime
+}
+
+fn indirect_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
+ <IndirectEvil>::static_evil(b)
+ //~^ ERROR cannot infer an appropriate lifetime
+}
+
+fn inherent_evil<'a, 'b>(b: &'b u32) -> &'a u32 {
+ <Evil>::inherent_evil(b) // bug? shouldn't this be an error
+}
+
+
fn main() {}