After fontforge.font object is closed, and its memory relased, any operation with its glyphs etc. causes segfault.

Sample script:

import sys, fontforge

font=fontforge.open(sys.argv[1])

gA = font["A"]
font.close()
l = gA.layers[1]

(run it with any Latin-enabled font, e.g. fontforge -script test.py Ambrosia.sfd)

Expected result: the script shall throw RuntimeError instead.

See also discussion in #5348.