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Simon Peyton Jones authored
This patch improves prepareRhs, so that it deals better with casts. We want to deal well cases like this v = (f e1 `cast` co) e2 Here we want to make e1,e2 trivial and get x1 = e1; x2 = e2; v = (f x1 `cast` co) v2 This really happens in parser libraries, which wrap functions in newtypes.
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