[Larceny-users] A very broken error message

[David Rush]

The transcript below says it all. Yes, the macro is erroneous, but I
made this mistake in the middle of a much larger macro definition, and
well..."cdr: () is not a pair" just isn't very informative, although
now that I know what went wrong I can see how it would arise.

I don't know if this is bad enough to consider a bug, but I did want
to raise it in hopes of a better tomorrow :)

(define-syntax foo (syntax-rules () ((foo bar? ...) (begin bar ...))))

(define-syntax foo (syntax-rules () ((foo bar? ...) (begin bar ...))))
WARNING from macro expander:
Redefining
foo
foo

(foo x)

(foo x)


Error: cdr: () is not a pair.
Entering debugger; type "?" for help.
debug>

[William D Clinger]

Post by David Rush
The transcript below says it all. Yes, the macro is erroneous, but I
made this mistake in the middle of a much larger macro definition, and
well..."cdr: () is not a pair" just isn't very informative, although
now that I know what went wrong I can see how it would arise.
I don't know if this is bad enough to consider a bug, but I did want
to raise it in hopes of a better tomorrow :)

Thanks! Logged as ticket #589:
https://trac.ccs.neu.edu/trac/larceny/ticket/589

Will