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Beni Cherniavsky-Paskin <cben@xxxxxxxxxxxx> wrote: > I'm getting some errors [guile 2.0.7]: Thanks for the report! I don't have guile 2.0.7 (yet); so this is a new problem to me. ... > -#0=(quote . #0#) > +'x Hmm.. This report means that when (all) the writers were asked to write out "(quote x)", they output: #0=(quote . #0#) Instead of the correct: 'x Clearly the writers are getting it *completely* wrong. What's weird is that the code works on older versions of guile, and it's based on fairly well-tested code. I'm also surprised the more complicated cases worked (!). My guess is that there's a semantics issue with the hash table implementation. If the hash table thought that the outer list and the symbol x were "eq?"... or used the wrong equality operator so they'd be considered equal... then the code would do this. Guile supports several hash table systems; I used the SRFI-69 hash tables because they are especially portable. But I did have to use a special declaration to get srfi-69 hash tables in guile without lots of spurious warnings. Perhaps that special declaration no longer works in guile 2.0.7. Can you replace the current lines: (use-modules ((srfi srfi-69) #:select ((make-hash-table . srfi-69-make-hash-table) (hash-table? . srfi-69-hash-table?) hash-table-set! hash-table-update!/default hash-table-ref hash-table-ref/default hash-table-walk hash-table-delete! ))) with just: (use-modules (srfi srfi-69)) and try again with guile 2.0.7? The guile 2 manual says that this is the correct way to import srfi-69: http://www.gnu.org/software/guile/manual/html_node/SRFI_002d69.html#SRFI_002d69 --- David A. Wheeler