Bug 6198 – [GSoC] ICE(e2ir.c) With circular import

Reduced test case from the GSoC mailing list: arraystorage.d: ---- import vector; struct ArrayViewStorage( T ) { ArrayStorage!T array_; } struct ArrayStorage( T ) { alias ArrayViewStorage!T View; this( BaseVector!View vec ) { } } ---- vector.d: ---- import arraystorage; struct BaseVector( Storage ) { Storage storage() { return stor; } Storage stor; } template Vector( T ) { alias BaseVector!( ArrayStorage!T ) Vector; } void main() { auto a = Vector!int(); } ---- Compile with: dmd arraystorage.d vector.d Note that reversing the order of files fixes the issue.