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Vars_Provider

envir.Vars_Provider

Vars_Provider -- abstract source of environment vars

Different heirs of this feature may provided different sources for environment
variables
If set, get the environment variable corresponding to v
Set the environment variable corresponding to n to have the
value v.

This will overwrite the value of the environment variable, if
it is set already.
Unset the environment variable corresponding to n.

This will also return success (unit) if the variable was not
set anyway.