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We ICED with a duplicated block-scope extern, as duplicate_decls was dropping the decl_lang_specific of olddecl. Simplys adding appropriate retrofitting and copying turned out to be insufficient because you can get a block-scope using decl also matching the extern. The latter seems a little suspicious and I have asked CWG for advice. While there robustified the assert about releasing olddecls' lang-specific -- if it had one, the new decl better have one. PR c++/97877 gcc/cp/ * decl.c (duplicate_decls): Deal with duplicated DECL_LOCAL_DECL_P decls. Extend decl_lang_specific checking assert. gcc/testsuite/ * g++.dg/lookup/pr97877.C: New.
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