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Make Data.Graph.Inductive.NodeMap handle slightly messy input without crashing

    • Closed Issue created by jyasskin @trac-jyasskin

    Using the current version of Data.Graph.Inductive casually is unnecessarily difficult because if you insert a node that's already present in the graph, or try to insert an edge with an endpoint that's not already in the graph, the library crashes. For the raw graph operations that's somewhat reasonable since it wouldn't know what labels to use. NodeMap, on the other hand, has plenty of information, so this patch makes it safer in these cases.

    I've also added the beginning of a test suite runnable with runhaskell Setup.hs test.

    Trac metadata
    Trac field Value
    Version 6.6
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component libraries (other)
    Test case
    Differential revisions
    BlockedBy
    Related
    Blocking
    CC erwig@eecs.oregonstate.edu, jyasskin@gmail.com
    Operating system Unknown
    Architecture Unknown
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