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compiler: Prohibit use of ellipsis operator on multi-valued calls.

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Fixes golang/go#9525.

From-SVN: r219984
This commit is contained in:
Ian Lance Taylor 2015-01-22 04:09:04 +00:00
parent fad513aa88
commit d4290ecad0
1 changed files with 11 additions and 0 deletions
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11
gcc/go/gofrontend/expressions.cc
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@ -8580,6 +8580,17 @@ Call_expression::do_lower(Gogo* gogo, Named_object* function,
{ {
Call_expression* call = this->args_->front()->call_expression(); Call_expression* call = this->args_->front()->call_expression();
call->set_is_multi_value_arg(); call->set_is_multi_value_arg();
if (this->is_varargs_)
{
// It is not clear which result of a multiple result call
// the ellipsis operator should be applied to. If we unpack the
// the call into its individual results here, the ellipsis will be
// applied to the last result.
error_at(call->location(),
_("multiple-value argument in single-value context"));
return Expression::make_error(call->location());
}
Expression_list* args = new Expression_list; Expression_list* args = new Expression_list;
for (size_t i = 0; i < rc; ++i) for (size_t i = 0; i < rc; ++i)
args->push_back(Expression::make_call_result(call, i)); args->push_back(Expression::make_call_result(call, i));