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A comment on Guile also supports the web at the programming language level. Parent comment

Re:Guile also supports the web at the programming language l... by jamie_ca on Friday December 17, 2010 @05:48PM (#2018202)
Parse it as lisp.

It's haskell-type-system-speak for "If you declare something to be a String, it really means String or null."

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Re:Guile also supports the web at the programming language l... by pjscott on Friday December 17, 2010 @06:46PM (#2018344)
The Haskell type for that would be "Maybe String". When you get a Maybe value, the compiler gives an error if you don't deal with the possibility that the value might be Nothing.
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