c++: placeholder type constraint inside range-for [PR99869]

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.

0 files changed, 0 insertions, 0 deletions