CSE Machine: Avoid pushing unnecessary env instructions #1687
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Description
This PR implements simple logic to avoid pushing
envInstr
when not needed. Specifically,envInstr
can be avoided if there are no environment-dependent commands on the control. A command is environment-dependent if its evaluation depends on the context given by the current environment.Implements and resolves #1682
Type of change
How to test
The following programs should run with no environment instructions being pushed