yield in lambdas mishandled

[pmp-p]

echo 'type((lambda: (yield))())' | ~/.local/bin/f2format -s 
Traceback (most recent call last):
  File "/Users/user/.local/bin/f2format", line 8, in <module>
    sys.exit(main())
  File "<string>", line None
bpc_utils.parsing.BPCSyntaxError: source file '<unknown>' contains the following syntax errors:
[L1C14] SyntaxError: 'yield' outside function

[gousaiyang]

This is yet another false positive from parso. It only checked whether yield is inside a funcdef context, while a lambdef context should also be acceptable.