result code = -1
standard error = {
tests/bugs/gh-449.slang(18): error 30019: expected an expression of type 'S', got 'vector<float,2>'
    foo(a + b);
          ^
tests/bugs/gh-449.slang(24): error 30019: expected an expression of type 'S', got 'vector<float,2>'
    foo(u + f);
          ^
}
standard output = {
}