Hello! Here is very simple code with error (lines numbered with `cat -n`)
1 ;(read-enable 'copy)
2
3 (define-syntax zero!
4 (lambda (x)
5 (syntax-case x ()
6 ((_ var)
7 (begin
8 (unless (identifier? #'var)
9 (syntax-violation 'zero! "identifier expected" #'var))
10 #'(set! var 0))))))
11
12 (zero! #f)
Trying to run or compile it of course leads to error, but it says
nothing about offending expression.
ice-9/boot-9.scm:106:20: In procedure #<procedure e1f4c0 at
ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: Syntax error:
unknown location: zero!: identifier expected
In this example `syntax-violation` is not actually needed, guard would
suffice. But if guard fails, I get "do not match pattern error" without
any clues what expectation I violated, and I found myself writing macros
compicated enough, that I want detailed description.
(read-enable 'positions) did not helped.
(read-enable 'copy) (commented line 1) cause Guile to hang.
When called from repl (load "foo.scm") repl hangs and do not respond
to ^C.
guile (GNU Guile) 2.0.9
Linux localhost 3.14.0-gnu #8 SMP Sat Apr 12 11:56:49 MSK 2014 x86_64 Intel(R)
Core(TM) i7 CPU Q 740 @ 1.73GHz GenuineIntel GNU/Linux
Any suggestions or workarounds?
--
Best regards, Dmitry Bogatov <kact...@gnu.org>,
Free Software supporter, esperantisto and netiquette guardian.
git://kaction.name/rc-files.git
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