Using the Guile json module in a gexp

[Christopher Baines <mail@cbaines.net>]

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Hey,

So I'm having some trouble using the Guile json module in a gexp.
I've added (with-imported-modules '((json)) ...), and the
module-import-compiled builder crashes.

Backtrace:
           4 (primitive-load "/gnu/store/35zv0m9wwd2nz3agyywv09d3k5v?")
In srfi/srfi-1.scm:
    640:9  3 (for-each #<procedure c10700 at ice-9/eval.scm:333:13 ?> ?)
In ice-9/eval.scm:
   245:16  2 (_ #(#(#<directory (guix build utils) 83f6e0> "/gn?") #))
In ice-9/boot-9.scm:
  1519:24  1 (_ "./json.scm")
In unknown file:
           0 (stat "./json.scm" #<undefined>)

ERROR: In procedure stat:
ERROR: In procedure stat: No such file or directory: "./json.scm"


The builder doesn't call stat directly, the stack trace gives line
numbers within other code, and its infeasible to add debugging mesasges
to the builder, as that requires rebuilding the world (at least with
the way I am running it).

I'll try and see if I can evaluate the same code outside of the
derivation to track down where it's calling stat, but let me know if
you can see what is going wrong.

Thanks,

Chris

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