Tests for ES6 arrow function, make sure parsing is OK in strict mode.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS f1(10) is 10
PASS f2(20) is 20
PASS f3(10, 20) is 30
PASS f4(20, 20) is 40
PASS foo(x => x + 1) is 11
PASS foo((x) => x + 1) is 11
PASS foo(x => { return x + 1; }) is 11
PASS foo((x) => { return x + 1; }) is 11
PASS successfullyParsed is true

TEST COMPLETE