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PR c/23143 * c-parser.c (c_parser_parms_list_declarator): Call mark_forward_parm_decls. * c-decl.c (merge_decls): Only check DECL_IN_SYSTEM_HEADER for decls with visibility structure. testsuite: * gcc.dg/parm-forwdecl-1.c, gcc.dg/parm-forwdecl-2.c, gcc.dg/parm-forwdecl-3.c, gcc.dg/parm-forwdecl-4.c: New tests. From-SVN: r102581
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