Because "VAR=VAL command" is sufficient to run 'command' with
environment variable VAR set to value VAL without affecting the
environment of the shell itself, but we cannot do the same with a
shell function (most notably, "test_must_fail"), we have subshell
invocations with multiple lines like this:

        ... &&
                VAR=VAL &&
                export VAR &&
                test_must_fail git command
        ) &&

which could be expressed as

        ... &&
        test_must_fail env VAR=VAL git comand &&

Find and shorten such constructs in existing test scripts.

Note that I am not 100% convinced myself that it is a good idea to
do this, so please do not add this to the list without seeing it


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