04b10596fe
The patches that follow revealed some latent type canonicalization issues during normalization/satisfaction, due to normalization of some constraint-expressions now being performed in different contexts and more frequently (since the normalization caches get frequently emptied in a checking compiler). The issues are: 1. In tsubst_parameter_mapping, we canonicalize the arguments of a substituted TYPE_ARGUMENT_PACK only if the argument we started with wasn't a TYPE_ARGUMENT_PACK. We should canonicalize a substituted TYPE_ARGUMENT_PACK regardless of what we started with. 2. We currently set DECL_CONTEXT and CONSTRAINT_VAR_P on each of the parameters introduced in a requires expression _after_ we're done processing the requirements. But meanwhile we may have already built and computed the canonical form of a type that uses one of these PARM_DECLs (as say an operand to decltype). But the canonical form depends on the result of cp_tree_equal, which in turn depends on the value of CONSTRAINT_VAR_P and DECL_CONTEXT. So we must set these fields earlier, before processing requirements. 3. In do_auto_deduction, we use the result of finish_decltype_type later as a template argument, so we should canonicalize the result too. (While we're here, we should pass 'complain' to finish_decltype_type, which fixes the testcase auto1.C below.) gcc/cp/ChangeLog: * constraint.cc (tsubst_parameter_mapping): Canonicalize the arguments of a substituted TYPE_ARGUMENT_PACK even if we've started with a TYPE_ARGUMENT_PACK. (finish_requires_expr): Don't set DECL_CONTEXT and CONSTRAINT_VAR_P on each of the introduced parameters here. * parser.c (cp_parser_requirement_parameter_list): Instead set these fields earlier, here. * pt.c (do_auto_deduction): Canonicalize the result of do_auto_deduction. Pass 'complain' to finish_decltype_type. gcc/testsuite/ChangeLog: * g++.dg/cpp1z/auto1.C: New test. |
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