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"the following two should never happen" span happens #968

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DanBurton opened this issue Jul 6, 2012 · 2 comments
Closed

"the following two should never happen" span happens #968

DanBurton opened this issue Jul 6, 2012 · 2 comments
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Cabal: other type: bug

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@DanBurton
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According to this file http://hackage.haskell.org/packages/archive/Cabal/1.14.0/doc/html/src/Distribution-ParseUtils.html

-- the following two should never happen:
Span n     l  :_ -> syntaxError n $ "unexpected span: " ++ show l
Line n _ _ l  :_ -> syntaxError n $ "unexpected line: " ++ show l

However if you attempt to use Haskell record update syntax as example code in the "description" field, you can make it happen. For example, if you use the following as the contents of a .cabal file:

description: > quux (foo { bar = baz })

You will get the error message

cabal: foo.cabal:1:  unexpected span: ")"

This may be connected to a deeper defect: curly braces do not display at all on Hackage package description pages.
@manzyuk
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manzyuk commented May 4, 2013

Related to (duplicate of?) Issue #774.

@ttuegel
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ttuegel commented Apr 23, 2015

Closing duplicate.

@ttuegel ttuegel closed this as completed Apr 23, 2015
frerich pushed a commit to frerich/catamorphism that referenced this issue Apr 10, 2018
Shortening the synposis and extending the description
b2e1e00 
It appears this is more like what's intended to get nice Haddock
documentation. Alas, I couldn't seem to reproduce the 'Expr' example
100% since passing a custom name for the catamorphism via

  $(makeCata defaultOptions { cataName = "foobar" } ''T)

always makes cabal choke with

  cabal: foo.cabal:1:  unexpected span: "''T"

It appears it's because of the curly braces, much like what was noted
in haskell/cabal#968 (but that ticket got
resolved years ago).
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@manzyuk @ttuegel @DanBurton