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List:       haskell-cafe
Subject:    Re: [Haskell-cafe] Is this a GHC parser error? A test case compiles from one line but not another.
From:       Alexis King <lexi.lambda () gmail ! com>
Date:       2017-09-10 4:54:19
Message-ID: 0AC2708B-5FA9-433E-9138-DC2CF2169A90 () gmail ! com
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> On Sep 9, 2017, at 18:14, David Feuer <david.feuer@gmail.com> wrote:
> 
> Where clauses are not *always* attached to definitions. They can also
> be attached to case branches.

Ah, you're right of course, I forgot about this.

> What I believe is true is that anywhere a set of guards could occur,
> they may be followed by a where clause, and vice versa.

This appears to be true in standard Haskell, but interestingly, it seems
that where clauses *cannot* be attached to a multi-way if expression.
Whether or not that counts as a "set of guards" is debatable, but I
usually think of them that way, so it's potentially worth nothing.

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