Why does clang emit these warnings?

The clang compiler emit warnings for the snippet below, as can be seen here.

clang++ -std=c++14 -O0 -Wall -pedantic -pthread main.cpp && ./a.out
main.cpp:1:18: warning: braces around scalar initializer [-Wbraced-scalar-init]
void point(int = {1}, int = {2}) {}
                 ^~~
main.cpp:1:29: warning: braces around scalar initializer [-Wbraced-scalar-init]
void point(int = {1}, int = {2}) {}
                            ^~~

2 warnings generated.

Why is this?

void point(int = {1}, int = {2}) {}

int main(){
    point();
}

As far as I can tell, {1} and {2} are perfectly valid default arguments according to [dcl.fct.default]/1, [dcl.fct]/3 and [dcl.init]/1.