a couple more bugs

[Doug Orleans <dougo at ccs dot neu dot edu>]

Mutating a "rest" argument gives a warning:

#|kawa:7|# (define (f . args) (set! args #f) args)
<stdin>:7:21: warning - cannot convert literal (of type java.lang.Boolean) to gnu.kawa.util.LList

(SLIB's comlist:make-list tickles this bug.)

Also, I was trying to see if Kawa recognized the "transformer" version 
of low-level macros-- this gives an understandable error:

#|kawa:1|# (define-syntax foo (transformer #f))
gnu.mapping.UnboundSymbol: Unbound symbol transformer
	at gnu.mapping.Environment.getChecked(Environment.java:223)
	at kawa.standard.ScmEnv.getChecked(ScmEnv.java:37)
	at gnu.expr.ReferenceExp.eval(ReferenceExp.java:84)
	at gnu.expr.ApplyExp.eval(ApplyExp.java:33)
	at gnu.expr.ApplyExp.eval(ApplyExp.java:37)
	at gnu.expr.ModuleExp.evalModule(ModuleExp.java:38)
	at kawa.Shell.run(Shell.java:85)
	at kawa.Shell.run(Shell.java:35)
	at kawa.Shell.run(Shell.java:19)
	at kawa.repl.main(repl.java:356)

But this crashes Kawa:

#|kawa:2|# (define-syntax foo (transformer (lambda () #f)))
Exception in thread "main" java.lang.ClassFormatError: atInteractiveLevel (Illegal constant pool index)
	at java.lang.ClassLoader.defineClass0(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:426)
	at gnu.bytecode.ArrayClassLoader.loadClass(ArrayClassLoader.java:97)
	at gnu.expr.LambdaExp.evalToClass(LambdaExp.java:1327)
	at gnu.expr.LambdaExp.eval(LambdaExp.java:1371)
	at gnu.expr.ModuleExp.evalModule(ModuleExp.java:39)
	at kawa.Shell.run(Shell.java:85)
	at kawa.Shell.run(Shell.java:35)
	at kawa.Shell.run(Shell.java:19)
	at kawa.repl.main(repl.java:356)

--dougo@ccs.neu.edu