Euh, sure
calibre-debug -f "FontFile.otf" "FontFile-subset.otf" -c U+2220-U+222F
Code:
Python function terminated unexpectedly
invalid syntax (<string>, line 1) (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 101, in main
File "site.py", line 78, in run_entry_point
File "site-packages\calibre\debug.py", line 276, in main
File "<string>", line 1
U+2220-U+222F
^
SyntaxError: invalid syntax