‘with-exception-handler’ rationale

[Nikita Karetnikov]

I’ve expected ‘with-exception-handler’ to behave like ‘catch’, but it
doesn’t.

scheme@(guile-user)> ,use (srfi srfi-34)
scheme@(guile-user)> (with-exception-handler (const "got it") (lambda () (raise 
"boom!")))
ice-9/boot-9.scm:106:20: In procedure #<procedure 94b0e40 at 
ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: Throw to key `srfi-34' with args `("boom!")'.

Entering a new prompt.  Type `,bt' for a backtrace or `,q' to continue.
scheme@(guile-user) [1]> 
scheme@(guile-user)> (catch 'misc-error (lambda () (error "boom!")) (const "got 
it"))
$1 = "got it"

Is there an explanation that doesn’t involve diving into the land of
continuations and dynamic wind?  I mean, when should I use the one but
not the other?

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