_ = f1() // ok
_, _ = f2() // ok
_ = f2() // ERROR "assignment mismatch: 1 variable but f2 returns 2 values|cannot assign"
+ _ = f1(), 0 // ERROR "assignment mismatch: 1 variable but 2 values|cannot assign"
T.M0 // ERROR "T.M0 .* not used"
t.M0 // ERROR "t.M0 .* not used"
cap // ERROR "use of builtin cap not in function call|must be called"