Report all errors, not just the first one

[domenic]

On

es6ify/compile.js

Line 25 in cdebf5d

return { source: null, sourcemap: null, error: errors[0] };

we throw away all compile errors except the first one. That's sad.

[domenic]

Also I kind of thought Traceur no longer threw an array but instead threw an aggregate error. So we might be doing something very wrong regardless.

[thlorenz]

We should ask the traceur team if/when there is ever more than one error.
If that is the case reasonably often we should start handling multiple errors and either combine them into one or emit/log each of them.

[domenic]

@johnjbarton I believe was the one on the Traceur team looking in to this most.

[johnjbarton]

We currently throw an array but we have an aggregate error as well. Your feedback would be helpful.
https://github.com/google/traceur-compiler/blob/master/src/util/CollectingErrorReporter.js