[u8]
[u8;N]
Specifically, this allows byte string literal patterns to be used where a `[u8]` or `[u8;N]` is expected when `deref_patterns` is enabled.
str
Specifically, this allows string literal patterns to be used where a `str` is expected when `deref_patterns` is enabled.
Implicit deref patterns allow previously ill-typed programs. Make sure they're still ill-typed without the feature gate. I've thrown in a test for `deref!(_)` too, though it seems it refers to `deref_patterns` as a library feature.