*The ghc-modi command

** Example

>|
% ghc-modi
check Foo.hs
Foo.hs:7:15:Not in scope: `B.append'
OK
bye
NG quit
%
|<

** Commands

? check <HaskellFile>
! Checks syntax with GHC
? find <symbol>
! Finds all module names exporting <symbol>
? info <HaskellFile> <expr>
! Displays information about the expression
? type <HaskellFile> <line> <column>
! Displays the types of all expressions including the expression
? lint \[hlint options\] <HaskellFile>
! Checks synstax with Hlint
? boot
! Displays boot information for Emacs front-end
? browse \[<package>:\]<module>
! Displays symbols of <module>
? quit (or empty string)
! Terminate ghc-modi

** Options

Option should be the form of Haskell's list of String (\[String\]).
Here is an example:

>|
lint ["--ignore=Use camelCase", "--ignore=Eta reduce"] Foo.hs
|<

** Session separators

?OK
! The session succeeded.
?NG <error message>
! The session fails. ghc-modi gets finished.