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Here we're rejecting the use of the lambda capture of 't' (of empty type) as a template argument ultimately because convert_nontype_argument checks constantness using is_constant_expression, which returns false for lambda captures since want_rval=false. But in this case I believe an lvalue-to-rvalue conversion of the argument is implied, so we should be using is_rvalue_constant_expression instead (which would return true here). However, it doesn't seem necessary to consider constantness at all when deciding whether to instantiate a non-dependent argument in convert_nontype_argument. So this patch gets rid of the problematic constantness test altogether, which incidentally also fixes the similar dg-ice'd testcase from PR87765. This is in line with a similar change we made to finish_decltype_type in r12-7564-gec0f53a3a542e7. PR c++/107437 PR c++/87765 gcc/cp/ChangeLog: * pt.cc (convert_nontype_argument): Relax is_nondep_const_expr test to !inst_dep_expr_p. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/lambda-generic-107437.C: New test. * g++.dg/cpp1z/constexpr-lambda26.C: Remove dg-ice.
14 lines
252 B
C
14 lines
252 B
C
// PR c++/87765
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// { dg-do compile { target c++17 } }
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// { dg-additional-options "-fchecking" }
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template <int N>
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using foo = int;
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struct A {
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constexpr int bar() const { return 42; }
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};
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void baz(A a) {
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[=](auto c) { return foo<a.bar()> { }; }; }
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