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jsm28 authored* c-decl.c (start_function): Check for old_decl being error_mark_node. testsuite: * gcc.dg/pr20368-1.c, gcc.dg/pr20368-2.c, gcc.dg/pr20368-3.c: New tests. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@97270 138bc75d-0d04-0410-961f-82ee72b054a4
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