D Compiler Bug?

[Bottled Gin]

> Not just separate compilation, I am facing issues when 
> compiling in one go as well. I am trying to reduce such a 
> testcase.
>

Alright. I reduced the circular dependency issue when compiling d 
files together. To reproduce:


$ git clone https://github.com/dsnippet/deploopbug.git
$ for i in *.d; do ldc2 -c $i; done # compiles without issue
$ ldc2 -c seq.d foo.d frop.d pol.d trump.d bar.d baz.d # no issue
$ ldc2 -c foo.d frop.d pol.d trump.d bar.d baz.d seq.d
frop.d(5): Error: function bool frop.frop.func(foo rhs, bar bee) 
does not override any function, did you mean to override bool 
foo.foo.func(foo rhs, bar bee)?

DMD also behaves similarly. Compiles without error when d modules 
compiled separately. No error when compiling files together in 
one order. With another order, the compiler fails.

> Will file bug soon. Just want to make sure that all dimensions 
> are covered.

https://issues.dlang.org/show_bug.cgi?id=19655
https://issues.dlang.org/show_bug.cgi?id=19656
https://issues.dlang.org/show_bug.cgi?id=19657