package01e.hs:2:1:
    Failed to load interface for ‘Data.Map’
    It is a member of the hidden package ‘containers-0.5.5.1’.
    Use -v to see a list of the files searched for.

package01e.hs:3:1:
    Failed to load interface for ‘Data.IntMap’
    It is a member of the hidden package ‘containers-0.5.5.1’.
    Use -v to see a list of the files searched for.