This adds SRFI-171 (transducers) to guile.
The two guile-specific additions are powerful transducers which can be
used to generalize transducers like tsegment. They are hard to get
right, but powerful and useful enough to warrant inclusion.
* doc/ref/srfi-modules.texi: added srfi-171 section
* module/Makefile.am (SOURCES):
* module/srfi/srfi-171.scm:
* module/srfi/srfi-171/meta.scm: Add SRFI-171
* module/srfi/srfi-171/gnu.scm: Add 2 guile-specific extensions.
* test-suite/Makefile.am (SCM_TESTS):
* test-suite/tests/srfi-171.test: Add tests.
Signed-off-by: Ludovic Courtès <ludo@gnu.org>
