Add test that shows the scope isn't working right

scm/inc/tests.scm

@@ -112,4 +112,6 @@
  '[["(let ((x 3) (y 4)) (+ x y))" "7\n"]
    ["(let ((b #t)) (boolean? b))" "#t\n"]
    ["(let ((x 3) (x 4)) x)" "4\n"]
    ["(let ((x 3)) (let ((x 4)) x))" "4\n"]])
    ["(let ((x 3)) (let ((x 4)) x))" "4\n"]
    ;["(let ((x 3)) (let ((x 4)) x) x)" "3\n"]
    ])