The test file will evaluate an expression that will cause the stack size to be doubled twice:
************************************************************** Results for Exercise 13.9 Enlarging stack ... Enlarging stack ... Assertion OK: (= (evaluate (1+(2+(3+(4+(5+(6+(7+(8+9))))))))) 45)
Note that push! issues a message when the stack size doubles first from 8 to 16, and again from 16 to 32.
See suggestions on next slide.