The following is a response from a developer on the C# compiler team: We get rid of unused locals (i.e., locals that are never read, even if assigned). We get rid of unreachable code. We get rid of try-catch w/ an empty try. We get rid of try-finally w/ an empty try (convert to normal code...). We get rid of try-finally w/ an empty finally (convert to normal code...). We optimize branches over branches: gotoif A, lab1 goto lab2: lab1: turns into: gotoif !A, lab2 lab1: We optimize branches to ret, branches to next instruction, and branches to branches.

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