E0001: Internal compiler error

Vuka produced Go that doesn't parse, or lost track of a construct it was rewriting. This is a bug in vuka, not in your code. Report it with the smallest file that shows it; meanwhile, rewriting the construct the error points at in plain Go usually gets past it.

Wrong

// any source: the message names the construct vuka failed on
x := f()?

Right

// the same, in plain Go, until the bug is fixed
x, err := f()
if err != nil {
	return err
}