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Just an ICE-on-invalid, but while writing tests for 123237 my typos would result in this crash often enough to prompt me to go ahead and fix it. We crash here because we are asserting that we've emitted hard errors when cp_parser_splice_specifier returns error_mark_node even when parsing tentatively. In the crash20.C case we have [:R<T>:] where we interpret the < as a "less than" operator and expect that T will produce a primary expression, which it does not. But cp_parser_error won't emit any errors yet. PR c++/124496 gcc/cp/ChangeLog: * parser.cc (cp_parser_splice_specifier): Use NULL_TREE instead of NULL. (cp_parser_splice_expression): Don't assert seen_error() when not committed to tentative parse. gcc/testsuite/ChangeLog: * g++.dg/reflect/crash20.C: New test. * g++.dg/reflect/crash21.C: New test. Reviewed-by: Jason Merrill <jason@redhat.com>
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