ICE: Self type not provided for type alias declarations in impls

[jjcnn]

The following impls both result in an ICE:

struct S {}

impl S {
    type D = [u64;1];
}

struct C<T> {
    a: T
}

impl<T> C<T>{
    type D = [T; 1];
}

The error message is Self type not provided.