I'm continuing to build the s7.c https://issues.dlang.org/show_bug.cgi?id=24187 with latest dmd $ dmd --version DMD64 D Compiler v2.106.0-beta.1 $ dmd s7.c #defines(3415): Error: cannot implicitly convert expression `_Complex(0.0, 1.0)` of type `_Complex!double` to `idouble` I cannot find the code which caused this problem (not on line 3415, BTW can dmd produce better error line number?); since idouble is a DMD internal type, and based on the error message, I think the error is obvious. So the question: can we add implicitly convert expression `_Complex(0.0, 1.0)` of type `_Complex!double` to `idouble`? Otherwise, we won't be able to compile s7.c (third party library).