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| $ echo "{-# LANGUAGE DoRec #-}" > tmp.hs
$ ghci-7.6.2 -Wall -fno-warn-warnings-deprecations tmp.hs
GHCi, version 7.6.2: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
tmp.hs:1:14: Warning:
-XDoRec is deprecated: use -XRecursiveDo or pragma {-# LANGUAGE RecursiveDo #-} instead
[1 of 1] Compiling Main ( tmp.hs, interpreted )
Ok, modules loaded: Main.
>>> :q
Leaving GHCi.
$
$
$
$ echo "{-# LANGUAGE RecursiveDo #-}" > tmp2.hs
$ ghci-7.4.2 -Wall -fno-warn-warnings-deprecations tmp2.hs
GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer-gmp ... linking ... done.
Loading package base ... linking ... done.
tmp2.hs:1:14:
Warning: -XRecursiveDo is deprecated: use -XDoRec or pragma {-# LANGUAGE DoRec #-} instead
[1 of 1] Compiling Main ( tmp2.hs, interpreted )
Ok, modules loaded: Main.
>>> :q
Leaving GHCi.
$
$
$
$ echo "srsly"
srsly |