From: simonpj@microsoft.com <unknown>
Date: Tue, 17 Nov 2009 12:55:26 +0000 (+0000)
Subject: exprIsHNF should "look through" lets
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exprIsHNF should "look through" lets

I can't quite remember when I spotted this, but exprIsHNF (and
similarly exprIsConLike) should ignore enclosing let-bindings,
since they don't affect termination.
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