FFI: "capi" calling convention doesn't work

According to http://www.haskell.org/ghc/docs/7.6.1/html/users_guide/ffi.html#ffi-capi there is a capi calling convention, but ghc disagrees:

% cat capi.hs 
{-# LANGUAGE ForeignFunctionInterface #-}

import Foreign.C

foreign import capi "math.h value M_PI" mPI :: CDouble

main :: IO ()
main = print mPI

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

capi.hs:5:16: parse error on input `capi'

Is the documentation wrong?

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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