Bad suggestion to restrict lifetime of `type = impl Trait`

[estebank]

rust/src/test/ui/impl-trait/multiple-lifetimes/error-handling.stderr

Lines 8 to 11 in ed33453

	help: to allow this `impl Trait` to capture borrowed data with lifetime `'a`, add `'a` as a constraint
	|
	LL | type E<'a, 'b> = impl Sized; + 'a
	|