'static lifetime annotations ignored on slices

[sfackler]

I would expect this to compile but it doesn't:

struct Foo {
    f: &'static [int]
}

fn main() {
    Foo {
        f: &'static [10]
    };
}

test.rs:7:12: 7:25 error: cannot infer an appropriate lifetime for automatic coercion due to conflicting requirements
test.rs:7         f: &'static [10]
                     ^~~~~~~~~~~~~
test.rs:6:5: 6:8 note: first, the lifetime cannot outlive the statement at 6:4...
test.rs:6     Foo {
              ^~~
test.rs:7:12: 7:25 note: ...so that reference does not outlive borrowed content
test.rs:7         f: &'static [10]
                     ^~~~~~~~~~~~~
note: but, the lifetime must be valid for the static lifetime...
test.rs:7:12: 7:25 note: ...so that expression is assignable (expected `&'static [int]` but found `&[int]`)
test.rs:7         f: &'static [10]
                     ^~~~~~~~~~~~~
error: aborting due to previous error
task 'rustc' failed at 'explicit failure', /build/rust-git/src/rust/src/libsyntax/diagnostic.rs:75
task '<main>' failed at 'explicit failure', /build/rust-git/src/rust/src/librustc/lib.rs:448

cc @nikomatsakis

[nikomatsakis]

Indeed, we currently seem to accept explicit lifetime parameters on
slice expressions but completely ignore them.

[huonw]

cc #11641

[sfackler]

Expression lifetime annotations have been removed from the language.