[Bug-kawa] [bug #18105] with-syntax causes NullPointerException during compilation but not in repl

[Chris Wegrzyn]

Follow-up Comment #1, bug #18105 (project kawa):

As an update, this appears to be a problem that results from having a let
expression inside of the first argument to syntax-case (which is the result
of expanding with-syntax). I have attached a simplified test that exhibits
this. I tracked the exception to two nested calls of
LetExp.apply(CallContext) which both have level == 4. This causes evalFrames
to be trashed.

The attached patch reorders syntax-case to rewrite the first argument to
syntax-case within the scope of the let statement, rather than before it. I'm
not sure whether the call to getLiteralsList should occur outside of that
scope, but it hasn't caused any problems for me yet.
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Additional Item Attachment:

File name: syntax-case-crash-2.scm        Size:0 KB
new test case
<http://savannah.gnu.org/bugs/download.php?file_id=11063>

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