Multi-line arrays must have a trailing comma after the last element.

Process completed with exit code 1.

A file should declare new symbols (classes, functions, constants, etc.) and cause no other side effects, or it should execute logic with side effects, but should not do both. The first symbol is defined on line 20 and the first side effect is on line 20.

Line exceeds 120 characters; contains 129 characters

Line exceeds 120 characters; contains 167 characters