Hi, Block comments whose contents end with an odd number of vertical bars are not parsed correctly by guile-2.0.2.
The guile manual [1] says: "Guile (starting from version 2.0) supports nested block comments as specified by R6RS and SRFI-30" R6RS [2] says: "Block comments may be indicated with properly nested #|and |# pairs." More formally, SRFI-30 [3] implies that in particular #| <comment-text> |# is a comment, where <comment-text> ---> <character sequence not containing #| or |#> Now look at this guile session: When I use a <comment-text> that ends in 1 or 3 or 5 ... trailing vertical bars, guile misses the end of the block comment and hangs. scheme@(guile-user)> '(a #|foo|# b) $1 = (a b) scheme@(guile-user)> '(a #|foo|||# b) $2 = (a b) scheme@(guile-user)> '(a #|foo|||||# b) $3 = (a b) scheme@(guile-user)> '(a #|foo||# b) [hangs] scheme@(guile-user)> '(a #|foo||||# b) [hangs] The bug is most likely located in libguile/read.c, function scm_read_r6rs_block_comment, line 1204. Bruno [1] http://www.gnu.org/software/guile/manual/html_node/Block-Comments.html [2] http://www.r6rs.org/final/html/r6rs/r6rs-Z-H-7.html#node_sec_4.2.3 [3] http://srfi.schemers.org/srfi-30/srfi-30.html -- In memoriam Irena Iłłakowicz <http://en.wikipedia.org/wiki/Irena_Iłłakowicz>
