rust/tests/ui/object-lifetime/object-lifetime-default-dyn-binding-nonstatic1.stderr

error[E0228]: the lifetime bound for this object type cannot be deduced from context; please supply an explicit bound
  --> $DIR/object-lifetime-default-dyn-binding-nonstatic1.rs:20:50
   |
LL | fn bar<'a>(x: &'a str) -> &'a dyn Foo<'a, Item = dyn Bar> { &() }
   |                                                  ^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0228`.
use static as object-lifetime default for type XX in `Foo<Item=XX>` Currently the default is "inherited" from context, so e.g. `&impl Foo<Item = dyn Bar>` would default to `&'x impl Foo<Item = dyn Bar + 'x>`, but this triggers an ICE and is not very consistent. This patch doesn't implement what I expect would be the correct semantics, because those are likely too complex. Instead, it handles what I'd expect to be the common case -- where the trait has no lifetime parameters. 2019-08-12 09:41:05 -05:00			`error[E0228]: the lifetime bound for this object type cannot be deduced from context; please supply an explicit bound`
			`--> $DIR/object-lifetime-default-dyn-binding-nonstatic1.rs:20:50`
			`\|`
			`LL \| fn bar<'a>(x: &'a str) -> &'a dyn Foo<'a, Item = dyn Bar> { &() }`
			`\| ^^^^^^^`

			`error: aborting due to previous error`

add long error explanation for E0228 2020-05-11 19:28:24 -05:00			For more information about this error, try `rustc --explain E0228`.