diff options
Diffstat (limited to 'docs/users_guide/bugs.rst')
| -rw-r--r-- | docs/users_guide/bugs.rst | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/docs/users_guide/bugs.rst b/docs/users_guide/bugs.rst index 4dc49f0328..b5ac79d457 100644 --- a/docs/users_guide/bugs.rst +++ b/docs/users_guide/bugs.rst @@ -76,13 +76,20 @@ Lexical syntax See `GHC Proposal #229 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0229-whitespace-bang-patterns.rst>`__ for the precise rules. -- As-patterns must not be surrounded by whitespace:: +- As-patterns must not be surrounded by whitespace on either side:: f p@(x, y, z) = ... -- accepted by both GHC and the Haskell Report - f p @ (x, y, z) = ... -- accepted by the Haskell Report but not GHC - When surrounded by whitespace, ``(@)`` is treated by GHC as a regular infix - operator. + -- accepted by the Haskell Report but not GHC: + f p @ (x, y, z) = ... + f p @(x, y, z) = ... + f p@ (x, y, z) = ... + + When surrounded by whitespace on both sides, ``(@)`` is treated by GHC as a + regular infix operator. + + When preceded but not followed by whitespace, ``(@)`` is treated as a + visible type application. See `GHC Proposal #229 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0229-whitespace-bang-patterns.rst>`__ for the precise rules. |