add export default failing tests

[guybedford]

Adds tests for #172

[caridy]

+1

[guybedford]

According to google/traceur-compiler#1159, (1) and (3) above are invalid.

But we should still work on (2).

[guybedford]

(2) is currently being tracked at google/traceur-compiler#1208

[guybedford]

I've updated this test to just include the single failing test case:

export default function() {
}

The cases export var default and export function default(){} are apparently not valid.

[caridy]

If I remember correctly, export function default(){} is going to be valid, but I can double check that.

[guybedford]

Yes. This is failing in Traceur currently because it tries export default FunctionDeclaration, and then fails. Instead of falling back to export default AssignmentExpression. The fix includes the words 'cover grammar'.

Sorry I misread your post! @arv believes it is invalid.

[arv]

It is invalid based on the notes for changing the grammar. We should bring this up tomorrow when we talk about modules at the F2F.

[caridy]

@arv is probably right, the one we discussed two months ago was this one: https://gist.github.com/ericf/a7b40bf8324cd1f5dc73#is-bar-hoisted-in-export-default-function-bar-

but I don't recall any conversation about this during the last F2F, @arv did you get a chance to run this by the other folks?

[arv]

I talked to @dherman and we decided that we want ClassExpression and FunctinExpression without names to work.

https://bugs.ecmascript.org/show_bug.cgi?id=3094