Home > Parse Error > Parse Error On Input Module

Parse Error On Input Module


Owner ndmitchell commented Dec 6, 2014 I suspect you have to put the ANN module after the import, since the annotation seems to be treated as a statement, which can only So the edge ('a','b',1) means that when given the input 1, move from state 'a' to state 'b'. Generating Pythagorean triples below an upper bound Cannot use hat in self-made command Human vs apes: What advantages do humans have over apes? Carrying Metal gifts to USA (elephant, eagle & peacock) for my friends TeX capacity exceeded with beamer I am designing a new exoplanet. Source

Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 24 Star 339 Fork 57 ndmitchell/hlint Code Issues 64 Pull requests 3 Projects Not the answer you're looking for? ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: Connection to failed. Here is the result of executing the above code in WinHugs: Main> putStr (hanoi_shower (hanoi 'a' 'b' 'c' 2)) Move 'a' to 'b'. http://stackoverflow.com/questions/19060560/haskell-module-parse-error-on-input-sayhello

Parse Error On Input ‘import’

Why isn't tungsten used in supersonic aircraft? You have solved my immediate issue. The problem is how to iterate over the elements (pairs) of the list while separating the first a of each pair from the second a. Student discount for Frankfurt Radio Symphony Orchestra more hot questions question feed lang-hs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback

How do I replace and (&&) in a for loop? 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 Join them; it only takes a minute: Sign up Haskell module ,parse error on input 'sayhello'"` up vote 0 down vote favorite module sayhello ( inChinese , inSpanish ) where inChinese We recommend upgrading to the latest Safari, Google Chrome, or Firefox.

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 Parse Error On Input Haskell describeList :: [a] -> String describeList xs = "The list is " ++ case xs of [] -> "empty." [x] -> "a singleton list." xs -> "a longer list." The error 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 get redirected here Does that work for you?

This means the below signature is invalid: ghci> map floor [1,2,3,4] :: [Float] and should instead be: ghci> map floor ([1,2,3,4] :: [Float]) or alternatively put the type signature on one Note: See TracTickets for help on using tickets. haskell functional-programming share|improve this question edited Apr 16 '12 at 4:42 Earlz 25.8k56207402 asked Apr 16 '12 at 4:03 cclerville 1,93441838 1 What is the error the compiler outputs? –Attila Admittedly I'm only slightly interested in GHC implementing support to allow this, since if multiple files are involved at all it causes module-finding trouble (obviously to me now); mostly I just

Parse Error On Input Haskell

One advantage of Haskell is that there are often many ways of performing the same action, including iterating over lists. 1.6 Guards (The following two tips on guards were contributed by https://wiki.haskell.org/Common_Misunderstandings Until then, understand that a missing do from the top of a function or code block can result in your compiler giving an error message citing a much later line number. Parse Error On Input ‘import’ In the first case each step of the computation is evaluating something to the effect of False || 'rest' where 'rest' is a tail recursive call to foldl'. Import Haskell Sound and Fury News & Articles Serious Business XKCD Meetups General Numberologics, Alchemy, Linguinomics, and other Academiology Mathematics Science Fictional Science Language/Linguistics

How do i fix this? this contact form Is a rebuild my only option with blue smoke on startup? GHC 7.0.1 and later). 1.2 If / Then / Else if-then statements must always include an 'else' portion. However, I do appreciate the recommendations.

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. It might be best not to think of if-then-else as flow control, as in most imperative languages, but think of it as construction of a value using a well formed expression. Terms Privacy Security Status Help You can't perform that action at this time. http://kiloubox.com/parse-error/parse-error-deprecated-syntax-the-grammar-module-is-expected.html Reduce function is not showing all the roots of a transcendental equation Student discount for Frankfurt Radio Symphony Orchestra How do I replace and (&&) in a for loop?

Whenever I try to compile the code, I get this error message.Code: Select allps2.hs:4:16: parse error on input `insertVertex'
Can anyone tell me what this message means? Problem solved. Okay, i'll go read up first. –Karthick Dec 19 '10 at 11:18 add a comment| 2 Answers 2 active oldest votes up vote 8 down vote accepted You can only use

I also tried to add the line: ignore "HLint: ignore Redundant do" = TestMain to the HLint file, but that had no effect either.

You can google foldl' vs foldl for some better explanations. Move 1 to 3. This is the error that I get: parse error on input `=' Failed, modules loaded: none. Line 9, character 16 is the beginning of the declaration of empty in the module interface.

Top Qoppa Posts: 694 Joined: Sat Nov 24, 2007 9:32 pm UTC Location: Yes. Are there any circumstances when the article 'a' is used before the word 'answer'? Any ideas on what could be producing this error messageCode: Select allFA.hs:21:0:
Occurs check: cannot construct the infinite type: a = b -> a
When generalising the Check This Out The directed graph will hold state values and path labels.

Not the answer you're looking for? asked 4 years ago viewed 887 times active 4 years ago Related 112Beginners Guide to Haskell?761Getting started with Haskell476Large-scale design in Haskell?88Haskell error parse error on input `='1Haskell parse error on If you agree, you can just close the issue, and I'll see where else I can report it. Similarly, in Haskell an if/then makes no sense without an else.

Join them; it only takes a minute: Sign up parse error on input '->' when using case up vote 1 down vote favorite I'm learning haskell by going through learn you current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Output the Hebrew alphabet Why do units (from physics) behave like numbers? I also addedCode: Select alltype v = Char
type e = Int
to the code and v,e to the module interface given to us in the template, so if that could

Already have an account? Thanks guys.Code: Select all-- CS 8 Problem Set 2
-- Author: Matt Stone

-- A module for creating and handling directed graphs

module Digraph (AdjList, Digraph, Edge,
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 Why is that?

haskell share|improve this question asked Aug 25 '14 at 9:32 Achaldo 735 Works fine on ideone. As I was typing that, I realized I forgot to add a comma after insertVertex when I commented out the other functions I need to implement. see original post please –BufBills Sep 27 '13 at 21:59 2 @NoName I think you can figure this out with a little thought and research. –jberryman Sep 27 '13 at 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) =

sort command : -g versus -n flag Extreme Value Theorem on Manifold AAA+BBB+CCC+DDD=ABCD Would there be no time in a universe with only light? 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 thanks! (-: mf59816 commented Dec 5, 2014 https://downloads.haskell.org/~ghc/7.8.3/docs/html/users_guide/extending-ghc.html#modann-pragma Perhaps something else besides hint is now expecting module annotations? Reload to refresh your session.

There are other ways of iterating over lists as well. more hot questions question feed lang-hs about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed 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