Seen on a custom builder:

BUILDSTDERR: ======================================================================
BUILDSTDERR: ERROR: test_scrypt (test.test_hashlib.KDFTests)
BUILDSTDERR: ----------------------------------------------------------------------
BUILDSTDERR: Traceback (most recent call last):
BUILDSTDERR:   File "/builddir/build/BUILD/Python-3.7.2/Lib/test/test_hashlib.py", line 942, in test_scrypt
BUILDSTDERR:     result = hashlib.scrypt(password, salt=salt, n=n, r=r, p=p)
BUILDSTDERR: ValueError: Invalid paramemter combination for n, r, p, maxmem.

There is a typo in "paramemter".