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Simon Peyton Jones authored
This patch adds tuple sections, so that (x,,z) means \y -> (x,y,z) Thanks for Max Bolinbroke for doing the hard work. In the end, instead of using two constructors in HsSyn, I used just one (still called ExplicitTuple) whose arguments can be Present (LHsExpr id) or Missing PostTcType While I was at it, I did a bit of refactoring too.
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