Our inner Ecmascript(also named Javascript for a historical reason)
has broken for a long time since tree-il has been updated.
When I try to implement a small language with Guile, I found that
current parse-tree-il doesn't need a list as its arg anymore.
And I changed the same line in
language/ecmascript/compile-tree-il.scm, then it works again!
No matter how many people interested in the inner ecmascript there be,
I like it and I wish it enhance more.
Anyway, multi-language is an interesting feature for Guile.

Here's the patch.