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Bad error message for flags with required but missing arguments

    • Closed Issue created by dramforever @dramforever 
    $ ghc -I
ghc: unrecognised flag: -I
did you mean one of:
  -I
  -F
  -v

Usage: For basic information, try the `--help' option.

    Which is confusing (Unrecognized -I. Did you mean -I?), and not informative (No mention of the missing argument)

    I expect something like "missing argument for -I", or a basic usage info on -I instead.

    It looks similar to #9776 (closed) to me.

    Trac metadata
    Trac field Value
    Version 8.0.1
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component Compiler
    Test case
    Differential revisions
    BlockedBy
    Related
    Blocking
    CC
    Operating system
    Architecture
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