On Wed, Mar 11, 2020 at 7:07 PM Jan Synacek <jsyna...@redhat.com> wrote:
> Hello, > > consider the following piece of code: > > $ cat test.scm > (use-modules (ice-9 regex)) > > (define (change text) > (regexp-substitute #f (string-match "string" text) > 'pre > "something" 0 > 'post)) > > (define (main) > (change "there will be no match")) > > (main) > > When I run the script, I get a backtrace: > > $ guile -s test.scm > Backtrace: > In ice-9/boot-9.scm: > 1736:10 8 (with-exception-handler _ _ #:unwind? _ # _) > In unknown file: > 7 (apply-smob/0 #<thunk 2237960>) > In ice-9/boot-9.scm: > 718:2 6 (call-with-prompt _ _ #<procedure default-prompt-handle…>) > In ice-9/eval.scm: > 619:8 5 (_ #(#(#<directory (guile-user) 225ef00>))) > In ice-9/boot-9.scm: > 2806:4 4 (save-module-excursion _) > 4351:12 3 (_) > In ice-9/ports.scm: > 550:4 2 (call-with-output-string _) > In ice-9/boot-9.scm: > 260:13 1 (for-each #<procedure 290ed20 at ice-9/regex.scm:143:1…> …) > In ice-9/regex.scm: > 64:2 0 (_ _) > I forgot one line in the backtrace output: ice-9/regex.scm:64:2: In procedure vector-ref: Wrong type argument in position 1 (expecting vector): #f Which sort of gives a hint, but not really... -- Jan Synacek Software Engineer, Red Hat
