_D13libd_demangle12__ModuleInfoZ
_D15TypeInfo_Struct6__vtblZ
_D3std5stdio12__ModuleInfoZ
_D3std6traits15__T8DemangleTkZ8Demangle6__initZ
_D47TypeInfo_S3std6traits15__T8DemangleTkZ8Demangle6__initZ

demangle is currently designed to demangle functions names, while the strings above are types. During parsing, demangle sees the string as a qualified name and then expects a type, and when it doesn't find one it figures the symbol isn't valid. It sounds like we either need a separate function for demangling types or if the demangle function encounters a 'Z' when it expects a type name it should realize it's demangling a type name, back up, and try again according to that logic. I suggest submitting a ticket.

To learn how the demangler works, the easiest thing is to copy core.demangle into your workspace and compile a small app with it directly, turning on the debug info. For example:

module abc;
import demangle_;
import std.stdio;

void main() {
        
writeln(decodeDmdString("_D47TypeInfo_S3std6traits15__T8DemangleTkZ8Demangle6__initZ"));
}

$ dmd abc -debug=trace -debug=info demangle

Thanks, I'll do that. (Odd, my original post vanished from the thread.)

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