guix-comm...@gnu.org writes:
> civodul pushed a commit to branch master > in repository guix. > > commit 8245bb74fc7bdcdc2f9d458057cefc9cd982e489 > Author: Ludovic Courtès <l...@gnu.org> > Date: Wed Feb 6 21:58:43 2019 +0100 > > monads, gexp: Prevent redefinition of syntax parameters. > > Fixes <https://bugs.gnu.org/27476>. > > This fixes multi-threaded compilation of this code where syntax > parameters could end up being redefined and where a race condition could > lead a thread to see the "wrong" value of the syntax parameter. > > * guix/monads.scm (define-syntax-parameter-once): New macro. > (>>=, return): Use it. > * guix/gexp.scm (define-syntax-parameter-once): New macro. > (current-imported-modules, current-imported-extensions): Use it. Oh yeah! Thank you so much for squashing this bug (and all of those it was merged with)! -- Ricardo
