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Simon Peyton Jones authored
In CSE we were getting lots of apprarently-unequal expressions with the same hash code. In fact they were perfectly equal -- but we were using a cheap-and-cheerful equality tests for CoreExpr that said False for any lambda expression! This patch adds a proper equality test for Core, with alpha-renaming. It's easy to do, and will avoid silly cases of CSE failing to fire. We should get less of this: WARNING: file compiler/simplCore/CSE.lhs line 326 extendCSEnv: long list, length 18 from a compiler built with -DDEBUG
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