https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67810
Bug ID: 67810
Summary: Non-expression recognized as fold expression
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: Casey at Carter dot net
Target Milestone: ---
r228351 fails to compile this correct program:
template <class...>
constexpr bool Test = true;
template <typename...Ts, bool = (Test<Ts&&...>)>
void f();
with error:
~/gcc6-r228351/bin/g++ -std=c++14 -c foo.cpp
foo.cpp:4:41: warning: fold-expressions only available with -std=c++1z or
-std=gnu++1z
template <typename...Ts, bool = (Test<Ts&&...>)>
^
foo.cpp:4:47: error: expected binary operator before ‘)’ token
template <typename...Ts, bool = (Test<Ts&&...>)>
^
foo.cpp:5:1: error: expected primary-expression before ‘void’
void f();
^
foo.cpp:5:1: error: expected ‘>’ before ‘void’
foo.cpp:5:9: error: expected unqualified-id before ‘;’ token
void f();
^
