GHC mode for converting files to explicit layout

One area where GHC is a little less friendly to newcomers is its Byzantine whitespace layout rules. Once you've gotten used to using GHC you can usually get what you want by abiding certain style, but before then it might be useful to see how GHC is inserting semicolons to your document.

I don't think this would be too hard to do. The idea is to get the token stream and look for virtual curlies with no location. Once you have a list of them, you can go over the original buffer again and insert a brace or semicolon whenever you see a token like this. Might be a good beginner task.

This function would also be useful for debugging layout, since knowing if semicolons are being inserted is useful.

Trac metadata

Trac field	Value
Version	7.11
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler (Parser)
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