multiline literals doesn't work with CPP extension.

If LANGUAGE CPP is enabled then multiline literals stops working. Steps to reproduce.

1. write a program with multiline literal: cat 1.hs

test = "mutli\
   \line"

main = putStrLn test

1. it should compile without CPP:

ghc 1.hs [1 of 1] Compiling Main ( 1.hs, 1.o ) Linking 1 ...

1. compile it with CPP extension

Expected result: program compiles

ghc 1.hs
[1 of 1] Compiling Main             ( 1.hs, 1.o )
Linking 1 ...

Actual result: compilation breaks

ghc -XCPP 1.hs
[1 of 1] Compiling Main             ( 1.hs, 1.o ) [flags changed]

1.hs:1:18:
    lexical error in string/character literal at character 'l'

At least ghc-7.8.4 and ghc-7.10 are affected.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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