Huh. I wonder if a section went missing; seems like none of the extensions that alter or relax layout are documented currently. (AlternativeLayoutRule, AlternativeLayoutRuleTransitional, DoAndIfThenElse, NondecreasingIndentation, RelaxedLayout)

IIRC DoAndIfThenElse relaxes a condition implied by layout but that normally only matters in "do": that if you break it into multiple lines, the "then" and "else" must be indented farther than the "if" or layout will consider them distinct new expressions (and thereby syntax errors).

On Thu, Feb 8, 2018 at 9:24 PM, Harendra Kumar <harendra.kumar@gmail.com> wrote:

Hi,

I recently found a mention of DoAndIfThenElse extension somewhere. I looked inside the ghc user guide and could not find any such extension. Then I looked in the ghc man page, no mention. I googled and found a very sparse references to it here and there. Then I tried using the extension with ghc and ghc seems to accept it. What's the story behind this, why is it not documented but accepted?

thanks,

harendra

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