CoffeeScript incompatibility with predefined values

[bbrk24]

'civet coffeeCompat'

class Foo
  [Symbol.toStringTag]: 'Foo'

console.log Foo::[Symbol.toStringTag]

This prints 'Foo' in CoffeeScript and undefined in Civet.

[edemaine]

One could argue that this is a bug in CoffeeScript. See jashkenas/coffeescript#4552 (especially toward the end).

That said, it currently is how CoffeeScript works, so it probably make sense to have a compatibility flag that triggers CoffeeScript's IIFE behavior, and perhaps the same coffeeClasses flag makes sense. Related to #457.

[STRd6]

As a workaround you can do this:

'civet coffeeCompat'

class Foo
  get [Symbol.toStringTag]() 'Foo'

console.log Foo::[Symbol.toStringTag]