X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=docs%2Fusers_guide%2Fghci.xml;h=c2bceeae4c06d30690b4012b2c10885949b576f1;hb=f61baf76c9fa20aa972938384887bcb52151e76f;hp=d9295484c85e2f84ddf5ea1550b7604f6898e7a4;hpb=ff8799ef2c8d0ab976fa9fc00fc4bc94e1ca5af9;p=ghc-hetmet.git diff --git a/docs/users_guide/ghci.xml b/docs/users_guide/ghci.xml index d929548..c2bceea 100644 --- a/docs/users_guide/ghci.xml +++ b/docs/users_guide/ghci.xml @@ -28,8 +28,11 @@ $ ghci -GHCi, version 6.8.1: http://www.haskell.org/ghc/ :? for help +GHCi, version 6.12.1: http://www.haskell.org/ghc/ :? for help +Loading package ghc-prim ... linking ... done. +Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. +Loading package ffi-1.0 ... linking ... done. Prelude> @@ -586,10 +589,12 @@ hello Prelude IO> - (Note: you can use import M as an - alternative to :module +M, and + (Note: you can use conventional + haskell import syntax as + well, but this does not support + * forms). :module can also be shortened to - :m). The full syntax of the + :m. The full syntax of the :module command is: @@ -814,12 +819,12 @@ it <- e ghci> reverse [] What should GHCi do? Strictly speaking, the program is ambiguous. show (reverse []) - (which is what GHCi computes here) has type Show a => a and how that displays depends + (which is what GHCi computes here) has type Show a => String and how that displays depends on the type a. For example: - ghci> (reverse []) :: String + ghci> reverse ([] :: String) "" - ghci> (reverse []) :: [Int] + ghci> reverse ([] :: [Int]) [] However, it is tiresome for the user to have to specify the type, so GHCi extends Haskell's type-defaulting @@ -2331,6 +2336,16 @@ bar + :run + :run + + + See :main. + + + + + :set option... :set @@ -2908,6 +2923,13 @@ Prelude> :set -fno-glasgow-exts because this is normally what you want in an interpreter: output appears as it is generated. + + If you want line-buffered behaviour, as in GHC, you can + start your program thus: + + main = do { hSetBuffering stdout LineBuffering; ... } + + @@ -2917,7 +2939,6 @@ Prelude> :set -fno-glasgow-exts