Code: https://is.gd/6L8tEl

fn foo<'a: 'static>() {}

Output:

rustc 1.17.0-nightly (b1e31766d 2017-03-03)
error[E0261]: use of undeclared lifetime name `'static`
 --> <anon>:1:12
  |
1 | fn foo<'a: 'static>() {}
  |            ^^^^^^^ undeclared lifetime

Expectation:

<'a: 'static> is unnecessary (you can just use 'static in place of 'a), but maybe we should accept it? At any rate, the error message is misleading - 'static is the one globally declared lifetime. If we want to reject this code, the error message should not imply 'static is undefined, but rather that you just don't need the 'a lifetime.