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Simon Peyton Jones authored
The float-in pass wasn't doing the right thing when you have let x{rule mentions y} = rhs in body It allowed a binding mentioning y to float into the body, which is obviously wrong. I think this bug has been there a long time; I don't really know why it has not come up before. It showed up when compiling Text.Regex.Base.Context with WAY=p in package regex-base.
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