mexpand on macrolet

[Ritchie Cai]

I'm not sure how to print a macroexpand on macros that defined in macrolet or symbol-macrolet.

with normal macros, I can do:

(defmacro test-macro [] '(+ 1 2))

(pprint (macroexpand-1 '(test-macro))) 

;; (+ 1 2)

;; nil

but with macrolet or symbol-macrolet:

(symbol-macrolet [(b [] '(+ 1 2))]

                               (pprint (mexpand-1 '(b))))

;; (b)

;; nil

(symbol-macrolet [(b [] '(+ 1 2))]

                               (pprint (mexpand-1 (b))))

;; 3

;; nil

what am I doing wrong?

Thanks

Ritchie

[retnuH]

This worked for me (after some experimentation):

(pprint (mexpand-1 '(symbol-macrolet [b (+ 1 2)] b)))

;; (do (+ 1 2))

;; nil

Cheers, 

H

[gianluca torta]

Hi Hunter,

however, in this way you are expanding the application of the macro "symbol-macrolet" (which is itself a macro), not just the symbol macro "b":

(pprint (mexpand-1 '(symbol-macrolet [b (+ 1 2)] b ["something" "else"])))
;; (do (+ 1 2) ["something" "else"])
;; nil

cheers,
Gianluca

[Hunter Kelly]

True!  But from what I understand of the way symbol-macrolet works, it's not possible to do one without the other.  symbol-macrolet actually looks for only symbols in the forms you pass it after the let bindings; it won't traverse inside any quoted forms.  It also takes care not to override the symbols that are shadowed by contained let statements, etc.

But I could be wrong - this was just after a quick look to see how it worked.

Cheers,

H

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