[commit: ghc] master: Lexer: Suggest adding 'let' on unexpected '=' token (0d6c97b)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/0d6c97ba1267a53825809f3c99364f7aa38f0847/ghc

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commit 0d6c97ba1267a53825809f3c99364f7aa38f0847
Merge: df63736 1ff7f09
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Tue Jun 16 20:04:02 2015 +0200

    Lexer: Suggest adding 'let' on unexpected '=' token
    
    Summary:
    I've heard numerous fledgling Haskeller's complain about the behavior of
    ghci regarding bindings. While most REPLs accept bindings of the form
    `x = 42`, GHCi is implicitly a `do` block, meaning that the user must
    know to use a `let` to introduce a binding.
    
    Here we suggest to the user that they may need a `let` and give them a
    small example in the event that we find an unexpected `=` token.
    
    Reviewers: austin
    
    Reviewed By: austin
    
    Subscribers: thomie, bgamari
    
    Differential Revision: https://phabricator.haskell.org/D980



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0d6c97ba1267a53825809f3c99364f7aa38f0847
 compiler/parser/Lexer.x                               | 3 +++
 testsuite/tests/ghci/should_run/T9915.stderr          | 5 ++++-
 testsuite/tests/parser/should_fail/readFail011.stderr | 5 ++++-
 testsuite/tests/parser/should_fail/readFail034.stderr | 5 ++++-
 4 files changed, 15 insertions(+), 3 deletions(-)