The following register-machine code is ambiguous, because the label here is defined more than once:
start (goto (label here)) here (assign a (const 3)) (goto (label there)) here (assign a (const 4)) (goto (label there)) there
With the simulator as written, what will the contents of register a be when control reaches there? Modify the extract-labels procedure so that the assembler will signal an error if the same label name is used to indicate two different locations.
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