Bug#918771: theano: FTBFS with cython3 0.29

[Rebecca N. Palmer]

Source: theano
Severity: important

[Originally reported privately]

When using cython3 from experimental, the build fails at this point:

cd theano/scan_module && cython3 scan_perform.pyx && patch 
--no-backup-if-mismatch scan_perform.c numpy_api_changes.diff && mv 
scan_perform.c -t c_code
/usr/lib/python3/dist-packages/Cython/Compiler/Main.py:367: 
FutureWarning: Cython directive 'language_level' not set, using 2 for 
now (Py2). This will change in a later release! File: 
/home/rnpalmer/Debian/builds/stackbuild/theano/theano/scan_module/scan_perform.pyx
   tree = Parsing.p_module(s, pxd, full_module_name)
patching file scan_perform.c
Hunk #1 FAILED at 6667.
Hunk #2 FAILED at 8237.
Hunk #3 FAILED at 8246.
Hunk #4 FAILED at 8285.
Hunk #5 FAILED at 8307.
5 out of 5 hunks FAILED -- saving rejects to file scan_perform.c.rej
make[1]: *** [debian/rules:31: override_dh_auto_build] Error 1
make[1]: Leaving directory '/home/rnpalmer/Debian/builds/stackbuild/theano'
make: *** [debian/rules:12: binary] Error 2

Skipping this patch is reported to build, but has not yet been tested.