Bug 2800 – Zeal excess in automatic conversion when using foreach and alias this

struct Tuple(U...) { U field; alias field this; } struct Iter { bool empty(); void next(); ref Tuple!(int, int) head(); } void main() { foreach (a; Iter()) { } } yields: ./test.d(16): Error: cannot implicitly convert expression (tuple(cast(Tuple!(int,int))__r1.head()._field_field_0,cast(Tuple!(int,int))__r1.head()._field_field_1)) of type (int, int) to Tuple!(int,int) ./test.d(16): Error: cannot implicitly convert expression (tuple(cast(Tuple!(int,int))__r1.head()._field_field_0,cast(Tuple!(int,int))__r1.head()._field_field_1)) of type (int, int) to Tuple!(int,int)

It was fixed in release 2.028.