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PR c++/68377 - parenthesized expr in fold-expression

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* parser.c (cp_parser_fold_expression): Check TREE_NO_WARNING.

From-SVN: r242561
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Jason Merrill 2016-11-17 16:40:41 -05:00 • committed by Jason Merrill
parent 77b384c53f
commit d168b3daa6
3 changed files with 23 additions and 1 deletions
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5
gcc/cp/ChangeLog
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@ -1,3 +1,8 @@
2016-11-17 Jason Merrill <jason@redhat.com>
PR c++/68377
* parser.c (cp_parser_fold_expression): Check TREE_NO_WARNING.
2016-11-16 Jason Merrill <jason@redhat.com>
PR c++/78373

4
gcc/cp/parser.c
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@ -4679,7 +4679,9 @@ cp_parser_fold_expression (cp_parser *parser, tree expr1)
/* The operands of a fold-expression are cast-expressions, so binary or
conditional expressions are not allowed. We check this here to avoid
tentative parsing. */
if (is_binary_op (TREE_CODE (expr1)))
if (EXPR_P (expr1) && TREE_NO_WARNING (expr1))
/* OK, the expression was parenthesized. */;
else if (is_binary_op (TREE_CODE (expr1)))
error_at (location_of (expr1),
"binary expression in operand of fold-expression");
else if (TREE_CODE (expr1) == COND_EXPR)

15
gcc/testsuite/g++.dg/cpp1z/fold8.C Normal file
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@ -0,0 +1,15 @@
// PR c++/68377
// { dg-options -std=c++1z }
struct Sink { } s;
template <class T> Sink& operator<<(Sink&, const T&);
template<class... Tx>
int f(Tx... xs) {
return ((xs+1) + ...);
}
int main() {
s << f(3,4,5) << "\n";
return 0;
}