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The Glorious Glasgow Haskell Compilation System User’s Guide, Version 6.10.4 11 / 224 1.8.10.14 old-time • Version number 1.0.0.1 (was 1.0.0.0) 1.8.10.15 packedstring • Version number 0.1.0.1 (was 0.1.0.0) 1.8.10.16 pretty • Version number 1.0.1.0 (was 1.0.0.0) • There is a new combinator zeroWidthText :: String -> Doc for printing things like ANSI escape sequences. 1.8.10.17 process • Version number 1.0.1.0 (was 1.0.0.1) • The System.Process API has been overhauled. The new API is a superset of the old API, however. 1.8.10.18 random • Version number 1.0.0.1 (was 1.0.0.0) 1.8.10.19 readline • This is no longer a bootlib; editline replaces it. 1.8.10.20 syb • This is a new bootlib, version 0.1.0.0. 1.8.10.21 template-haskell • Version number 2.3.0.0 (was 2.2.0.0) • The datatypes now have support for Word primitives. • currentModule :: Q String has been replaced with location :: Q Loc, where Loc is a new datatype. 1.8.10.22 unix • Version number 2.3.1.0 (was 2.3.0.1) • The System.Posix.Terminal.BaudRate type now includes B57600 and B115200 constructors. 1.8.10.23 Win32 • Version number 2.2.0.0 (was 2.1.1.1) • No longer defines the UNICODE CPP symbol for packages that use it.
The Glorious Glasgow Haskell Compilation System User’s Guide, Version 6.10.4 12 / 224 Chapter 2 Using GHCi GHCi 1 is GHC’s interactive environment, in which Haskell expressions can be interactively evaluated and programs can be interpreted. If you’re familiar with Hugs, then you’ll be right at home with GHCi. However, GHCi also has support for interactively loading compiled code, as well as supporting all 2 the language extensions that GHC provides. . GHCi also includes an interactive debugger (see Section 2.5). 2.1 Introduction to GHCi Let’s start with an example GHCi session. You can fire up GHCi with the command ghci: $ ghci GHCi, version 6.8.1: http://www.haskell.org/ghc/ Loading package base ... linking ... done. Prelude> :? for help There may be a short pause while GHCi loads the prelude and standard libraries, after which the prompt is shown. As the banner says, you can type :? to see the list of commands available, and a half line description of each of them. We’ll explain most of these commands as we go along. For Hugs users: many things work the same as in Hugs, so you should be able to get going straight away. Haskell expressions can be typed at the prompt: Prelude> 1+2 3 Prelude> let x = 42 in x / 9 4.666666666666667 Prelude> GHCi interprets the whole line as an expression to evaluate. The expression may not span several lines - as soon as you press enter, GHCi will attempt to evaluate it. 2.2 Loading source files Suppose we have the following Haskell source code, which we place in a file Main.hs: main = print (fac 20) fac 0 = 1 fac n = n * fac (n-1) 1 The ‘i’ stands for “Interactive” 2 except foreign export, at the moment
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