[m-rev.] for post-commit review: io.environment.m and io.call_system.m

[Zoltan Somogyi]

2022-03-08 11:04 GMT+11:00 "Peter Wang" <novalazy at gmail.com>:
> The rest is fine.

As shown by the attached committed diff, I followed
all your suggestions. Thanks for the review.

Given that decode_system_command_exit_code is used
in two modules, and does not seems to require any implementor-
level understanding to use, should we make it a *documented*
part of io.call_system.m?

Zoltan.
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