get-environment-variables fails with error in MIT Scheme 11.2

[Sam Lee]

The "get-environment-variables" procedure appears to be broken in MIT
Scheme 11.2.

    1 ]=> (get-environment-variables)

    ;The procedure
    ;To continue, call RESTART with an option number:
    ; (RESTART 1) => Return to read-eval-print level 1.

    2 error>

Is this a bug, or am I doing something wrong?