delModFromLib :: ModuleName -> CondTree ConfVar [Dependency] Library ->
    CondTree ConfVar [Dependency] Library
delModFromLib modName ct@CondNode{condTreeData = lib} =
    ct{condTreeData = lib{exposedModules = delete modName (exposedModules lib)}}
delModFromLib :: ModuleName -> CondTree ConfVar [Dependency] Library ->
    CondTree ConfVar [Dependency] Library
delModFromLib modName ct@CondNode{condTreeData = lib} =
    ct{condTreeData = lib{exposedModules = delete modName (exposedModules lib)}}
delModFromLib modName ct@CondNode{condTreeData = lib} =
    ct{condTreeData = lib{exposedModules = delete modName (exposedModules lib)}}