https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103524 Bug 103524 depends on bug 100881, which changed state.
Bug 100881 Summary: [modules] default arguments break when the default argument's type isn't explicitly included/exported https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100881 What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED