I meet a syntax error when i build the hss, but it seems no wrong with the syntax, and i don't change anything.

[XianluoCat]

File "tools/compression/hss-deflate.py", line 44
    def deflate(data: bytes, compression_level: int = 9) -> bytes:
                    ^
SyntaxError: invalid syntax
make: *** [envm-wrapper/Makefile:95: Default/hss-l2scratch.bin.deflate] Error 1
"make all" terminated with exit code 2. Build might be incomplete.

[TommyMurphyTM1234]

Looks like the hss-deflate.py script may be getting invoked using Python 2 rather than Python 3. Python 2 doesn't support parameter typing hints, unlike Python 3. You should check your environment to see if that's the problem.