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PR c++/88795 reports an ICE building a function_type for a deduction guide when the substitution into the function signature fails, due to an error_mark_node being returned from tsubst_arg_types but not being checked for. This error_mark_node gets used as the TYPE_ARG_TYPES, leading to ICEs in various places that assume this is a TREE_LIST. This patch checks the result of tsubst_arg_types and propagates the failure if it returns error_mark_node. It also adds an assertion to build_function_type, to fail faster if passed in error_mark_node. gcc/cp/ChangeLog: PR c++/88795 * pt.c (build_deduction_guide): Bail out if tsubst_arg_types fails. gcc/testsuite/ChangeLog: PR c++/88795 * g++.dg/template/pr88795.C: New test. gcc/ChangeLog: PR c++/88795 * tree.c (build_function_type): Assert that arg_types is not error_mark_node. From-SVN: r267957 |
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