This is not-quite-intuitive behavior. The `case' form is based on
`eqv?' instead of `equal?', and the first example works because string
literals are interned, while the result of `string-append' is not.
Should we change `case' to use `equal?' instead of `eqv?'? I can't
think of a good reason to stick with `eqv?'.
At Mon, 19 Nov 2012 14:07:16 +0100, Laurent wrote:
> Hi,
>
> Is this a bug or a not quite intuitive normal behavior?
> > (define (foo s)
> (case s
> [("a") 'a]
> [else 'none]))
> > (foo "a")
> 'a
> > (foo (string-append "a" ""))
> 'none
>
> in 5.3.1.5--2012-11-08(5589bcb/a) [3m].
>
> Laurent
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