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re PR c++/67164 (ICE: tree check: expected class ‘expression’, have ‘exceptional’ (argument_pack_select) in tree_operand_check, at tree.h:3356)

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PR c++/67164

	* pt.c (copy_template_args): New.
	(tsubst_pack_expansion): Use it.

From-SVN: r233954
This commit is contained in:
Jason Merrill 2016-03-03 20:45:43 -05:00 committed by Jason Merrill
parent 6fdb0d67d0
commit 264fd1424e
3 changed files with 62 additions and 1 deletions
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4
gcc/cp/ChangeLog
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@ -1,5 +1,9 @@
2016-03-03 Jason Merrill <jason@redhat.com>
PR c++/67164
* pt.c (copy_template_args): New.
(tsubst_pack_expansion): Use it.
* call.c (build_aggr_conv): Use get_nsdmi.
PR c++/51406

30
gcc/cp/pt.c
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@ -178,6 +178,7 @@ static int check_cv_quals_for_unify (int, tree, tree);
static void template_parm_level_and_index (tree, int*, int*);
static int unify_pack_expansion (tree, tree, tree,
tree, unification_kind_t, bool, bool);
static tree copy_template_args (tree);
static tree tsubst_template_arg (tree, tree, tsubst_flags_t, tree);
static tree tsubst_template_args (tree, tree, tsubst_flags_t, tree);
static tree tsubst_template_parms (tree, tree, tsubst_flags_t);
@ -11037,11 +11038,12 @@ tsubst_pack_expansion (tree t, tree args, tsubst_flags_t complain,
/* For each argument in each argument pack, substitute into the
pattern. */
result = make_tree_vec (len);
tree elem_args = copy_template_args (args);
for (i = 0; i < len; ++i)
{
t = gen_elem_of_pack_expansion_instantiation (pattern, packs,
i,
args, complain,
elem_args, complain,
in_decl);
TREE_VEC_ELT (result, i) = t;
if (t == error_mark_node)
@ -11136,6 +11138,32 @@ make_argument_pack (tree vec)
return pack;
}
/* Return an exact copy of template args T that can be modified
independently. */
static tree
copy_template_args (tree t)
{
if (t == error_mark_node)
return t;
int len = TREE_VEC_LENGTH (t);
tree new_vec = make_tree_vec (len);
for (int i = 0; i < len; ++i)
{
tree elt = TREE_VEC_ELT (t, i);
if (elt && TREE_CODE (elt) == TREE_VEC)
elt = copy_template_args (elt);
TREE_VEC_ELT (new_vec, i) = elt;
}
NON_DEFAULT_TEMPLATE_ARGS_COUNT (new_vec)
= NON_DEFAULT_TEMPLATE_ARGS_COUNT (t);
return new_vec;
}
/* Substitute ARGS into the vector or list of template arguments T. */
static tree

29
gcc/testsuite/g++.dg/cpp0x/variadic-tuple2.C Normal file
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@ -0,0 +1,29 @@
// PR c++/67164
// { dg-do compile { target c++11 } }
#include <type_traits>
namespace detail {
template <bool ...b>
struct fast_and
: std::is_same<fast_and<b...>, fast_and<(b, true)...>>
{ };
}
template <typename ...Xn>
struct tuple {
tuple() { }
template <typename ...Yn, typename = typename std::enable_if<
detail::fast_and<std::is_constructible<Xn, Yn&&>::value...>::value
>::type>
tuple(Yn&& ...yn) { }
template <typename ...Yn, typename = typename std::enable_if<
detail::fast_and<std::is_constructible<Xn, Yn const&>::value...>::value
>::type>
tuple(tuple<Yn...> const& other) { }
};
tuple<tuple<>> t{};
tuple<tuple<>> copy = t;