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This PR seems to be similar to PR c++/43382, except that the recursive call to the variadic function with trailing return type in this testcase is additionally given some explicit template arguments. In the first testcase below, when resolving the recursive call to 'select', fn_type_unification first substitutes in the call's explicit template arguments before doing unification, and so during this substitution the template argument pack for Args is incomplete. Since the pack is incomplete, the substitution of 'args...' in the trailing return type decltype(f(args...)) is handled by the unsubstituted_packs case of tsubst_pack_expansion. But the handling of this case happens _before_ we reset local_specializations, and so the substitution ends up reusing the old binding for 'args' from local_specializations rather than building a new one. This patch fixes this issue by setting up local_specializations sooner in tsubst_pack_expansion, before the handling of the unsubstituted_packs case. It also adds a new policy to local_specialization_stack so that we could use the class here to conditionally replace local_specializations. gcc/cp/ChangeLog: PR c++/94628 * cp-tree.h (lss_policy::lss_nop): New enumerator. * pt.c (local_specialization_stack::local_specialization_stack): Handle an lss_nop policy. (local_specialization_stack::~local_specialization_stack): Likewise. (tsubst_pack_expansion): Use a local_specialization_stack instead of manually saving and restoring local_specializations. Conditionally replace local_specializations sooner, before the handling of the unsubstituted_packs case. gcc/testsuite/ChangeLog: PR c++/94628 * g++.dg/cpp0x/variadic179.C: New test. * g++.dg/cpp0x/variadic180.C: New test.
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