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In the testcase below, during ahead-of-time deduction of a constrained auto inside a range-based for loop, we trip over an assert within do_auto_deduction which expects the deduction context to be adc_return_type or adc_variable_type, but do_range_for_auto_deduction calls do_auto_deduction with the context defaulted to adc_unspecified. We could safely relax the assert to also accept adc_unspecified, but it seems the deduction context should really be adc_variable_type here. gcc/cp/ChangeLog: PR c++/99869 * parser.c (do_range_for_auto_deduction): Pass adc_variable_type to do_auto_deduction. gcc/testsuite/ChangeLog: PR c++/99869 * g++.dg/cpp2a/concepts-placeholder6.C: New test.
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