tests: Uncomment now valid GAT code behind FIXME
The code fails to parse with `nightly-2021-02-05`: $ cargo +nightly-2021-02-05 build error: generic associated types in trait paths are currently not implemented --> src/main.rs:9:42 | 9 | fn _bar<T: for<'a> StreamingIterator<Item<'a> = &'a [i32]>>(_iter: T) { /* ... */ | ^^^^ but parses with `nightly-2021-02-06`: $ cargo +nightly-2021-02-06 build warning: the feature `generic_associated_types` is incomplete and may not be safe to use and/or cause compiler crashes warning: 1 warning emitted because it was (with high probability) fixed by PR 79554 which was merged within that nightly range.
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