Noticed today that deprecation warnings are
slightly broken in -HEAD:

  mtl-2.2.1/Control/Monad/Error/Class.hs:46:1: warning:
    Module ‘Control.Monad.Trans.Error’ is deprecated:
      ([", U, s, e,  , C, o, n, t, r, o, l, ., M, o, n, a, d, ., T, r, a,
        n, s, ., E, x, c, e, p, t,  , i, n, s, t, e, a, d, "],
       Use Control.Monad.Trans.Except instead)

Commit e6191d1c


slightly changed WarningTxt declaration:

-data WarningTxt = WarningTxt (Located SourceText) [Located FastString]
-                | DeprecatedTxt (Located SourceText) [Located FastString]
+data WarningTxt = WarningTxt (Located SourceText)
+                             [Located (SourceText,FastString)]
+                | DeprecatedTxt (Located SourceText)
+                                [Located (SourceText,FastString)]

But 'moduleWarn' function was not updated to do the stripping.

Signed-off-by: Sergei Trofimovich <siarheit@google.com>

Reviewers: austin, bgamari, hvr, goldfire, rwbarton, alanz

Reviewed By: rwbarton, alanz

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1096

GHC Trac Issues: #10313