https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92206
--- Comment #12 from Jason Merrill <jason at gcc dot gnu.org> --- Author: jason Date: Wed Nov 27 22:05:41 2019 New Revision: 278784 URL: https://gcc.gnu.org/viewcvs?rev=278784&root=gcc&view=rev Log: PR c++/92206 - ICE with typedef to dependent alias. rsandifo's patch for 92206 demonstrated a problem with the existing checking for alias template specializations: they were returning false for a typedef to an alias template specialization. Which is sometimes what the caller wants, and sometimes not: Sometimes we're interested in whether the type was written as an alias template-id, and sometimes whether it represents one. The testcase illustrates a case that remained wrong with the earlier patch: if the typedef is itself an alias template specialization, we can't strip an underlying dependent alias. * pt.c (dependent_alias_template_spec_p) (alias_template_specialization_p): Add transparent_typedefs parameter. (iterative_hash_template_arg, any_template_parm_r) (primary_template_specialization_p, tsubst, dependent_type_p_r): Adjust. * decl.c (check_elaborated_type_specifier): Adjust. * error.c (dump_template_bindings, dump_aggr_type): Adjust. Added: trunk/gcc/testsuite/g++.dg/cpp0x/alias-decl-pr92206-4.C Modified: trunk/gcc/cp/ChangeLog trunk/gcc/cp/cp-tree.h trunk/gcc/cp/decl.c trunk/gcc/cp/error.c trunk/gcc/cp/pt.c trunk/gcc/cp/tree.c trunk/gcc/cp/typeck.c
