https://issues.dlang.org/show_bug.cgi?id=18955
Issue ID: 18955 Summary: extern(C++) default struct mangling is overridden when interacting with a `cppmangle = class` tamplate Product: D Version: D2 Hardware: x86_64 OS: Windows Status: NEW Severity: normal Priority: P1 Component: dmd Assignee: nob...@puremagic.com Reporter: turkey...@gmail.com test.c: ------------------------------------------------ extern (C++, std) { extern (C++) struct char_traits(Char) { } extern (C++, class) struct basic_string(T, Traits, Alloc) { } alias string = basic_string!(char, char_traits!char); } extern (C++) void test(ref const(std.string) str) {} ------------------------------------------------ char_traits has no mangle spec, so it should mangle as struct, and it does... except in this case where it's used an a template argument to basic_string which is mangled as a class, char_traits gets promoted to mangle as a class too, not only in the instantiation of basic_string but even when it appears on its own too. char_traits should mangle as a struct, because that's how it's declared. --