bcd07f26

By: Tom Sydney Kerckhove <syd@cs-syd.eu> 

Add RemoveCase and RemoveAction mutation operators

RemoveCase removes one alternative from a case expression (n mutations for
n arms, only when n >= 2). RemoveAction removes one BodyStmt from a do
block, leaving BindStmt, LetStmt, and LastStmt untouched.

Add example source and tests for both operators.
Dependencies Timing

Agent Instructions

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