b1005f553d
95568 complains that CTAD for aggregates doesn't work within requires-clause and it turned out that it doesn't work when we try the deduction in a template. The reason is that maybe_aggr_guide creates a guide that can look like this template<class T> X(decltype (X<T>::x))-> X<T> where the parameter is a decltype, which is a non-deduced context. So the subsequent build_new_function_call fails because unify_one_argument can't deduce anything from it ([temp.deduct.type]: "If a template parameter is used only in non-deduced contexts and is not explicitly specified, template argument deduction fails.") Those decltypes come from finish_decltype_type. We can just use TREE_TYPE instead. I pondered using unlowered_expr_type, but that didn't make any difference for the FIELD_DECLs I saw in class-deduction-aggr6.C. gcc/cp/ChangeLog: PR c++/95568 * pt.c (collect_ctor_idx_types): Use TREE_TYPE. gcc/testsuite/ChangeLog: PR c++/95568 * g++.dg/cpp2a/class-deduction-aggr5.C: New test. * g++.dg/cpp2a/class-deduction-aggr6.C: New test. |
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| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
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| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
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| .dir-locals.el | ||
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