Bug 14678 – Bogus cannot create a struct until its size is determined error

See sample code: enum AstTypeKind { Foo, Bar, } struct AstType { mixin TypeMixin!(AstTypeKind, Payload); this(AstTypeKind) { } import othermodule; } alias ParamAstType = AstType.ParamType; union Payload { ParamAstType* params; } template TypeMixin(K, Payload) { Payload payload; alias ParamType = PackedType!(typeof(this)); struct PackedType(T, U...) { Payload payload; auto getType() { return T(AstTypeKind.Foo); } } } Other module can be an empty file. What is in it doesn't matter, the import being there is the only thing that does matter. Line 32: Error: cannot create a struct until its size is determined Line 25: Error: template instance type.AstType.TypeMixin!(AstTypeKind, Payload).PackedType!(AstType) error instantiating

Good news! This issue is duplicate of Issue 6766, which has been fixed in HEAD. *** This issue has been marked as a duplicate of issue 6766 ***

How the hell do you find these duplicates that fast ?

I do a regression test and find which pull request fixes the testcase. TrenD ( http://digger.k3.1azy.net/trend/ ) has all D builds cached, so the regression test runs quickly.