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test failed when I run command $make test
FAILED (failures=1, skipped=1)
test test_re failed
2 tests failed again:
 test_re test_venv

Is it something specific to the environment? I tried the test on Ubuntu 16.04 on both master and on v3.6.3 with no errors. Maybe if you can execute the following code based on which the test is executed then it will be helpful to debug this.
import locale
foo, enc = locale.getlocale(locale.LC_CTYPE)
# Search non-ASCII letter
for i in range(128, 256):
 try:
 c = bytes([i]).decode(enc)
 sletter = c.lower()
 if sletter == c: continue
 bletter = sletter.encode(enc)
 if len(bletter) != 1: continue
 if bletter.decode(enc) != sletter: continue
 bpat = re.escape(bytes([i]))
 break
 except (UnicodeError, TypeError):
 pass
else:
 bletter = None
 bpat = b'A'
# Bytes patterns
print(bletter)
print(bpat)
print(foo)
print(enc)
Thanks

Looking at the traceback in the screenshot this seems to be same as issue29571 happening on en_IN locale.

Yeah, that's a duplicate of bpo-29571 which has been fixed by:
New changeset 279657bac2856039ba422c18a3d7f227b455e9d6 by Victor Stinner in branch '3.7':
[3.7] bpo-29571: Fix test_re.test_locale_flag() (GH-12178)
https://github.com/python/cpython/commit/279657bac2856039ba422c18a3d7f227b455e9d6
Python 3.7.3 and newer include my fix.