[commit: ghc] master: Error out on `Main` without `main` in GHCi (#7765) (0fa2072)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/0fa20726b0587530712677e50a56c2b03ba43095/ghc

>---------------------------------------------------------------

commit 0fa20726b0587530712677e50a56c2b03ba43095
Author: Thomas Miedema <thomasmiedema at gmail.com>
Date:   Mon Feb 23 03:38:26 2015 -0600

    Error out on `Main` without `main` in GHCi (#7765)
    
    Summary:
    GHC does 2 validation checks for module `Main`:
    * does `main` exist
    * is `main` exported (#414)
    
    The second check is done in ghc as well as in ghci (and runghc and ghc -e).
    The first check however is currently not done in ghci, to prevent "'main' is
    not in scope" errors when loading simple scripts. See commit d28ba8c8009 for
    more information.
    
    This commit tightens the special case for ghci. When the file does not contain
    a main function, but does contain an explicit module header (i.e. "module Main
    where"), then /do/ raise an error in ghci (and runghc and ghc -e) as well
    
    Test Plan:
    module/T7765: a module Main with an explicit module header but without a
    main function should be an error for all Ways.
    
    Additionaly: delete test module/mod174. It was added in commit 5a54c38, but it
    is a duplicate of module/T414.
    
    Reviewers: austin
    
    Reviewed By: austin
    
    Subscribers: thomie
    
    Differential Revision: https://phabricator.haskell.org/D649
    
    GHC Trac Issues: #7765


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0fa20726b0587530712677e50a56c2b03ba43095
 compiler/typecheck/TcRnDriver.hs                   | 37 +++++++---------------
 compiler/typecheck/TcRnMonad.hs                    |  5 +--
 compiler/typecheck/TcRnTypes.hs                    |  4 ++-
 compiler/utils/IOEnv.hs                            |  9 +++---
 docs/users_guide/7.12.1-notes.xml                  |  3 +-
 testsuite/tests/deriving/should_fail/T5686.hs      |  2 +-
 .../tests/ghci/prog012/{Main.hs => FooBar.hs}      |  2 +-
 testsuite/tests/ghci/prog012/prog012.script        |  2 +-
 testsuite/tests/ghci/scripts/ghci022.hs            |  2 +-
 testsuite/tests/ghci/scripts/ghci027.script        |  4 +--
 testsuite/tests/ghci/scripts/ghci027_1.hs          |  2 +-
 testsuite/tests/ghci/scripts/ghci027_2.hs          |  2 +-
 .../{ghci/scripts/ghci022.hs => module/T7765.hs}   |  1 -
 testsuite/tests/module/T7765.stderr                |  2 ++
 testsuite/tests/module/all.T                       |  4 +--
 testsuite/tests/module/mod174.hs                   |  9 ------
 testsuite/tests/module/mod174.stderr               |  3 --
 testsuite/tests/parser/should_fail/readFail013.hs  |  2 +-
 18 files changed, 36 insertions(+), 59 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc 0fa20726b0587530712677e50a56c2b03ba43095