Home > Parse Error > Parse Error On Input Import Haskell

Parse Error On Input Import Haskell

Contents

Should I boost his character level to match the rest of the group? Is a rebuild my only option with blue smoke on startup? I am actively using stack, so if no-one will step-up, I will make sure I understand involved elisp code and will add precisely what is needed then. Notice that since a and b in (a, b) are polymorphic types, they can range over both Chars and Ints. Source

Thanks! The problematic code segment was the following: hanoi_shower :: Show a => [(a, a)] -> String hanoi_shower [(a, b)] = "Move " ++ show a ++ " to " ++ show [email protected] darius lambdabotdarius has a karma of 0 [email protected] ddarius lambdabotYou have a karma of 3 rhz?karma lambdabotYou have a karma of 0 SamBrhz: you can't do foreign imports in the While your Foo works, with a small modification I get this: $ hlint Foo.hs Foo.hs:3:1: Warning: Parse error: import Found: module Foo where {-# ANN module "HLint: ignore Redundant do" #-}

Parse Error On Input Haskell

You can google foldl' vs foldl for some better explanations. What exact message are you getting? While it's probably > possible to compile this code by making sure that the extension isn't > active (for instance, using ghc instead of ghci), it is probably a > better What does 'tirar los tejos' mean?

Top stone915 Posts: 42 Joined: Wed Jan 07, 2009 4:31 am UTC Re: Haskell - "Parse error on input" Quote Postby stone915 » Mon Jan 26, 2009 5:40 am UTC Here's In both cases, the error messages don't help to identify the problem. (Entry added by Benjamin L. Windows is missing in GRUB! Haskell Import I think you mean to add another argument to that, most likely "input".

Any module intended to be imported must be in an appropriately named file, e.g. Here are some mistakes that have been observed from multiple sources. 1.1 Indentation Perhaps the first trip-up - you might understand that indentation defines where a code block starts and the So it should be fixed by regex fix, similar to the one I did for myself. https://www.haskell.org/pipermail/beginners/2010-March/003827.html Reload to refresh your session.

Another common mistake that some beginners make is writing "if" in front of the guard conditions; viz.: myfunction x y | if x < 2 = "a" | if y > Haskell Lambda I think I'm going to leave the v and e data types generalized though, because that was part of the original template and I think my prof wants it to be haskell share|improve this question asked Oct 7 '13 at 9:50 user1528601 184 It must have generated a file called lexer.hs, please post that file content –Ankur Oct 7 '13 asked 3 years ago viewed 1769 times active 3 years ago Related 761Getting started with Haskell309What is Haskell actually useful for?13Tracking down errors in Haskell88Haskell error parse error on input `='0parse

Haskell Parse Error On Input Module

Found an article about the different types of folds if anyone else is interested.http://haskell.org/haskellwiki/Foldr_Foldl_Foldl' Top stone915 Posts: 42 Joined: Wed Jan 07, 2009 4:31 am UTC Re: Haskell - "Parse error https://ghc.haskell.org/trac/ghc/ticket/2428 Basically, it will hold a directed graph, an initial value, and a list of possible final values. Parse Error On Input Haskell One should also recognize that the types returned by the then and else branches must match due to Haskell's strong and static type system. Ghci "parse Error On Input |" However, ghc-7.8.3 fails: tests/TestMain.hs:26:1: parse error on input ‘module’ I am reporting this here in the hope there is a trivial solution.

There are other ways of iterating over lists as well. http://kiloubox.com/parse-error/parse-error-haskell.html Top stone915 Posts: 42 Joined: Wed Jan 07, 2009 4:31 am UTC Re: Haskell - "Parse error on input" Quote Postby stone915 » Tue Jan 27, 2009 3:01 am UTC Laguana module Module.Name' goes in Module/Name.hs'." ( This happened to me a long time ago... Russell.) 1.7 Parentheses (The following tip on parentheses was contributed by the user 7stud in the thread "Top beginner mistakes" (see http://article.gmane.org/gmane.comp.lang.haskell.beginners/1121) on the Haskell-Beginners mailing list on Wed, 4 Mar Haskell Let

There's also a standard function for what you are trying to do.Made some changes:Code: Select all-- A module for creating and handling directed graphs

module Digraph where --my 2 cents: Sorry this isn't the full picture - for an inverse point of view see do notation considered harmful. 1.5 Iterating Over a List Some beginners confuse a single-element list pattern (such If someone will want to step-in, please write here. have a peek here Browse other questions tagged haskell or ask your own question.

k-bx commented Jul 15, 2015 @gracjan how would you tell if stack's output is stabilized? Line 9, character 16 is the beginning of the declaration of empty in the module interface. Similarly, in Haskell an if/then makes no sense without an else.

Russell.) 2 See also What a Monad is not Retrieved from "https://wiki.haskell.org/index.php?title=Common_Misunderstandings&oldid=60549" Category: FAQ Navigation Haskell Wiki community Recent changes Random page Tools What links here Related changes Special pages Printable

But I got another problem. I guess this makes sense because the ANN is a kind of statement? I don't think I'm going to use too many of your modifications, partly because it involves code we haven't covered in class yet and partly because I'd rather turn in code The graph will contain a list of ordered pairs made up of a vertex and a list of vertices connected to that vertex (an adjacency list).

Privacy policy About HaskellWiki Disclaimers Search: LoginHelp/GuideAbout TracPreferencesRegister WikiTimelineRoadmapBrowse SourceView TicketsSearchBlog Context Navigation ← Previous TicketNext Ticket → GHC Trac Home GHC Home   Joining In Report a bug Newcomers info What to do with my pre-teen daughter who has been out of control since a severe accident? Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc. Check This Out Also, any new blocks (ex: from an if or case) must have their own do, even if the higher level code block already had one.

Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 60 Star 771 Fork 239 haskell/haskell-mode Code Issues 92 Pull requests 4 Projects up vote 0 down vote favorite I've just took up haskell and alex/happy because I wanted to write a parser. Example compilation output that's not highlighted: -*- mode: haskell-compilation; default-directory: "~/workspace/protocol-buffers/" -*- HsCompilation started at Wed Jul 15 02:09:36 cd /Users/kb/workspace/protocol-buffers/ && stack build hprotoc-2.1.3-0bfa2fc6ae7966890c323cb09dc4b57f: unregistering (missing dependencies: alex, protocol-buffers, protocol-buffers-descriptor) Are illegal immigrants more likely to commit crimes?

but I was reminded by #2427 ) Oldest first Newest first Threaded Comments only Change History (7) comment:1 Changed 8 years ago by igloo difficulty set to Unknown Milestone set to Here is a corrected version of the code above: hanoi_shower :: Show a => [(a, a)] -> String hanoi_shower moves = unlines ["Move " ++ show a ++ " to "++ Terms Privacy Security Status Help You can't perform that action at this time. Notice how this makes no sense without z.

I got another problem: it shows: Output was redirected with -o, but no output will be generated because there is no Main module. How to do \widthof with a symbol N(e(s(t))) a string are the integers modulo 4 a field? Additionally, you need to change TokStr strip(s) to TokStr (strip s) { module ValkenLexer where } %wrapper "basic" $digit = 0-9 $alpha = [a-zA-Z] tokens :- $white+ ; $alpha+ { \s So it's line 9, character 16 causing the error.

Reload to refresh your session. #haskell - Fri 13 Apr 2007 between 22:08 and 22:16 NY Lost Funds Page:Prev777879808182838485NextLastDay: Previous Next rhzsorear: ghci is telling me: parse error on input `import' Another way of writing hanoi_shower, using map, is as follows: hanoi_shower :: Show a => [(a, a)] -> String hanoi_shower moves = unlines (map move moves) where move (a, b) = I will take a look today if I can do that properly. Second problem which still exists is that, when you try to "go" by the error-file, emacs doesn't know where to find it, asking you to point it to the "root project