Give more readable errors for dataBranch failures
#6068
Merged
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This PR should give more comprehensible errors in the case of a
dataBranchproblem. Instead of just printing the closure, it does some case analysis to just explain what sort of closure it was. Also, I've switched to using short printing ofReferencevalues.It has cases for when you have a data type case that isn't covered by the branches, but I'm not sure the interpreter can ever actually get there, because default cases are inserted by the compiler.