Too constrained types for list operations
-----------------------------------------

                 Key: LS-595
                 URL: http://dev.sourcefabric.org/browse/LS-595
             Project: Liquidsoap
          Issue Type: Bug
            Reporter: Samuel Mimram
            Priority: Critical


Some of the generic functions operating on lists are restricted to lists of 
strings. For instance:

_[_] : (string,[(string*string)])->string
list.assoc : (string,[(string*string)])->string
list.hd : ([string])->string
etc.

For the two first, this might just be that association lists should be 
generalized to be able to contain any elements indexed by strings. But list.hd 
is clearly a bug.

Notice that this is not the case for all functions operating on lists for 
instance:

list.length : (['a])->int
list.tl : (['a])->['a]

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