ghc generates more user-friendly error messages
Test Plan: Compiled ghc fine. Opened ghci and fed it invalid code. It gave the improved error messages in response. Reviewers: austin Subscribers: thomie, simonpj, spacekitteh, rwbarton, simonmar, carter Differential Revision: https://phabricator.haskell.org/D201
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- compiler/parser/Lexer.x 2 additions, 0 deletionscompiler/parser/Lexer.x
- compiler/parser/Parser.y 39 additions, 0 deletionscompiler/parser/Parser.y
- compiler/typecheck/TcErrors.lhs 13 additions, 1 deletioncompiler/typecheck/TcErrors.lhs
- testsuite/tests/annotations/should_fail/annfail08.stderr 4 additions, 1 deletiontestsuite/tests/annotations/should_fail/annfail08.stderr
- testsuite/tests/deriving/should_fail/drvfail007.stderr 1 addition, 0 deletionstestsuite/tests/deriving/should_fail/drvfail007.stderr
- testsuite/tests/ghci.debugger/scripts/break003.stderr 3 additions, 1 deletiontestsuite/tests/ghci.debugger/scripts/break003.stderr
- testsuite/tests/ghci/scripts/Defer02.stderr 6 additions, 2 deletionstestsuite/tests/ghci/scripts/Defer02.stderr
- testsuite/tests/mdo/should_fail/mdofail005.stderr 3 additions, 1 deletiontestsuite/tests/mdo/should_fail/mdofail005.stderr
- testsuite/tests/parser/should_fail/ParserNoLambdaCase.stderr 1 addition, 1 deletiontestsuite/tests/parser/should_fail/ParserNoLambdaCase.stderr
- testsuite/tests/parser/should_fail/readFail020.stderr 2 additions, 1 deletiontestsuite/tests/parser/should_fail/readFail020.stderr
- testsuite/tests/parser/should_fail/readFail040.stderr 3 additions, 1 deletiontestsuite/tests/parser/should_fail/readFail040.stderr
- testsuite/tests/rebindable/rebindable6.stderr 3 additions, 0 deletionstestsuite/tests/rebindable/rebindable6.stderr
- testsuite/tests/typecheck/should_fail/T2846b.stderr 3 additions, 1 deletiontestsuite/tests/typecheck/should_fail/T2846b.stderr
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