T1789.hs:6:1: Warning:
    The module ‘Prelude’ does not have an explicit import list

T1789.hs:7:1: Warning:
    The module ‘Data.Map’ does not have an explicit import list

T1789.hs:9:1: Warning:
    The import item ‘Maybe(..)’ does not have an explicit import list

T1789.hs:10:1: Warning:
    The module ‘Data.Maybe’ does not have an explicit import list