The bindings in the body of the let are [(constant’(“x”),0,0)]. There is only one binding of “x” to offset 0 and depth 0.
Recall that bindings are a triple of identifier (with some type information), offset from the SP (i.e. Stack Pointer), and depth which was described in the section on implementing functions. The first x is bound to SP+0 which supposedly holds the value 5. The y is bound to SP+1 which holds 10. Finally, the second x is bound to SP+2 which hold 7. In the third version of the bindings the first x is not visible even though it is in the bindings. The scope of the first x extends through the body of the expression but it is not always visible since the innermost scope includes another x binding. The result of executing the program is 22.
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