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| author | Patrick Palka <ppalka@redhat.com> | 2021-10-07 10:02:54 -0400 |
|---|---|---|
| committer | Patrick Palka <ppalka@redhat.com> | 2021-10-07 10:02:54 -0400 |
| commit | 2e6e0d86a06389056d0e7fecc99c547420ad787a (patch) | |
| tree | 135d1870a5006339b21054e2fcec4ed1d5d3a0c1 /gcc | |
| parent | 9b239d05ffd5a17ede44abd55bc6622c6e279868 (diff) | |
| download | gcc-2e6e0d86a06389056d0e7fecc99c547420ad787a.zip gcc-2e6e0d86a06389056d0e7fecc99c547420ad787a.tar.gz gcc-2e6e0d86a06389056d0e7fecc99c547420ad787a.tar.bz2 | |
c++: variadic ttp constraint subsumption [PR99904]
Here we're crashing when level-lowering the variadic constraint C<Ts...>
on the template template parameter TT because tsubst_pack_expansion expects
processing_template_decl to be set during a partial substitution.
PR c++/99904
gcc/cp/ChangeLog:
* pt.c (is_compatible_template_arg): Set processing_template_decl
around tsubst_constraint_info.
gcc/testsuite/ChangeLog:
* g++.dg/cpp2a/concepts-ttp4.C: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cp/pt.c | 2 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp2a/concepts-ttp4.C | 9 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c index 19e0336..1e52aa7 100644 --- a/gcc/cp/pt.c +++ b/gcc/cp/pt.c @@ -8230,8 +8230,10 @@ is_compatible_template_arg (tree parm, tree arg) { tree aparms = DECL_INNERMOST_TEMPLATE_PARMS (arg); new_args = template_parms_level_to_args (aparms); + ++processing_template_decl; parm_cons = tsubst_constraint_info (parm_cons, new_args, tf_none, NULL_TREE); + --processing_template_decl; if (parm_cons == error_mark_node) return false; } diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-ttp4.C b/gcc/testsuite/g++.dg/cpp2a/concepts-ttp4.C new file mode 100644 index 0000000..cf3e71e --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp2a/concepts-ttp4.C @@ -0,0 +1,9 @@ +// PR c++/99904 +// { dg-do compile { target c++20 } } + +template<class... Ts> concept C = (Ts::value && ...); +template<class... Ts> requires C<Ts...> struct A; +template<class T> requires true struct B; +template<template<class... Ts> requires C<Ts...> class TT> struct S; +using ty1 = S<A>; +using ty2 = S<B>; // { dg-error "constraint" } TT's constraints don't subsume B's |