Function std::os::setenv
pub fn setenv(n: &str, v: &str)
Sets the environment variable n to the value v for the currently running
process
Failure
Fails if n or v have any interior NULs.
pub fn setenv(n: &str, v: &str)
Sets the environment variable n to the value v for the currently running
process
Fails if n or v have any interior NULs.
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct (or str), enum,
trait, typedef (or
tdef).