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pp_readline,close,getc: explain NULL stack arg
authorDavid Mitchell <davem@iabyn.com>
Fri, 14 Jul 2017 14:23:29 +0000 (15:23 +0100)
committerDavid Mitchell <davem@iabyn.com>
Thu, 27 Jul 2017 10:30:23 +0000 (11:30 +0100)
commit12dc5f9406fbb8389be8b9f9406ad247ca07f210
tree43c1d807a312fb0ded41d8e8ace03a6ef339a5d7
parenta9372a4640d52f451e21d4f26b1105811563d003
pp_readline,close,getc: explain NULL stack arg

add code comments to explain why these functions can sometimes be called
with a NULL pointer on the stack.

(feature introduced by v5.15.2-112-g30901a8)
pp_hot.c
pp_sys.c