Lexical error in string continuation

Harendra Kumar harendra.kumar at gmail.com
Sat Jan 7 22:22:47 UTC 2017

Hi devs,

I am making a change in runghc on the ghc master branch. When compiling the
following code (edited/new code in utils/runghc):

208 splitGhcNonGhcArgs :: [String] -> IO ([String], [String])
209 splitGhcNonGhcArgs args = do
210    let (ghc, other) = break notAFlag args
211    when (hasUnescapedGhcArgs ghc) $
212        hPutStrLn stderr "yy\
213                                    \ xx"

I get an error because of the string continuation at line 212. If I put the
backslashes on the same line I do not get any error. I have more string
continuations in the same file and they all work fine. This snippet works
fine with ghc-7.10.3/ghc-8.0.1 when compiled separately. Here is the error
message that I get:

utils/runghc/Main.hs:212:56: error:

    lexical error in string/character literal at character 'x'


212 |         hPutStrLn stderr "yy\

       |                                                        ^

utils/runghc/ghc.mk:30: recipe for target
'utils/runghc/dist-install/build/Main.dyn_o' failed

make[2]: *** [utils/runghc/dist-install/build/Main.dyn_o] Error 1

Makefile:122: recipe for target 'all_utils/runghc' failed

make[1]: *** [all_utils/runghc] Error 2

make[1]: Leaving directory '/vol/hosts/cueball/workspace/play/ghc'

../../mk/sub-makefile.mk:50: recipe for target 'all' failed

make: *** [all] Error 2

Any help will be appreciated. I can send the modified file if anyone wants
to reproduce/debug.

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