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After r16-6808-g4b0e94b394fa38, we started to ICE when the std_attrs was error_mark_node. This fixes the problem by checking if it was an error_mark_node before looking for annotations. Bootstrapped and tested on x86_64-linux-gnu with no regressions. Changes since v1: * v2: Move the check for error mark earlier. * v3: small formating changes. PR c++/124307 gcc/cp/ChangeLog: * parser.cc (cp_parser_base_specifier): Check for error mark like checking for non-nullness on the attribute. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/alignas24.C: New test. Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>
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