OCaml: Can't run utop after installing it

Error processing SSI file


  1. Titus

    • 2020/11/16

    My Ubuntu-14 / Mint was also "borked"

    After reading Ubuntu section here ; https://opam.ocaml.org/doc/Install.html

    AND removing .opam/ dir before again doing;

    1. opam init
    2. opam install utop

    fixed it !

  2. Axl

    • 2017/7/11

    Wellesley College. List Processing in Ocaml. Given a list of integers ns, suppose we want to return a new list of the same length in which each element is one 

  3. Sam

    • 2015/11/24

    OCaml possesses an interactive system, called “toploop”, that lets you type OCaml code and have it evaluated immediately. It is a great way to learn the language and to quickly experiment with ideas. Below, we demonstrate the use of the toploop to illustrate basic capabilities of the language. Some indications for the code below.

  4. Kylan

    • 2016/12/22

    Feb 28, 2009

  5. Neri

    • 2018/8/10

    So, I did try eval 'opam config env' and this is what happens:

    $ eval 'opam congif env'
    CAML_LD_LIBRARY_PATH="/home/jharvard/.opam/4.01.0/lib/stublibs"; export CAML_LD_LIBRARY_PATH; 
    PERL5LIB="/home/jharvard/.opam/4.01.0/lib/perl5"; export PERL5LIB;
    OCAML_TOPLEVEL_PATH="/home/jharvard/.opam/4.01.0/lib/toplevel"; export OCAML_TOPLEVEL_PATH;
    MANPATH="/home/jharvard/.opam/4.01.0/man:"; export MANPATH; PATH="/home/jharvard/.opam/4.01.0/bin:/etc/log50.d:/etc/log50.d:/usr/lib/qt-3.3/bin:/etc/log50.d:/usr/libexec/lightdm:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/jharvard/.local/bin:/home/jharvard/bin"; export PATH;

    And then it still says that the "utop" command is not found. The paths above are gibberish to me. Would anyone be able to look at what it returned to see if that indicates what the problem might be?

  6. Leonard

    • 2018/12/27

    OCaml interpreted the semicolon before print_string "ok\n" as sequencing it within the scope of the let expression, rather than after the entire if / then / else .

  7. Reginald

    • 2018/5/18

    OCaml Programming Guidelines This is a set of reasonable guidelines for formatting OCaml programs—guidelines which reflect the consensus among veteran OCaml programmers. Nevertheless, all detailed notifications of possible errors or omissions will be noted with pleasure. To send your comments using GitHub issues.

  8. Major

    • 2021/4/4

    Lists in OCaml Actually, OCaml's language description permits evaluating e2 first; the Cons: If e1 : t and e2 : t list then e1::e2 : t list. With parens for clarity:.

  9. Elliott

    • 2017/6/23

    Regarding utop, it seems that you don't have in your $PATH. Did you do:

    $ eval `opam config env`

    If you want opam to be correctly automatically setup in your new shells you should add the following to your .bashrc:

    . ~/.opam/opam-init/init.sh > /dev/null 2> /dev/null || true

    As for not being able to open Core.Std, you won't of course be able to open it in your shell, this command must be issued in utop.

  10. Kolten

    • 2017/8/13

    OCaml Introduction: Tuples and Lists JeffMeister CSE130,Winter2011 Sofar,wehaveonlydealtwithexpressionsofsinglevaluesofasingletype,like5 : int or9.7 : float

  11. Brooks

    • 2019/7/18

    Appendix A First steps in OCaml. Let us first check the “Hello world” program. Use the ocaml hello.ml Objective Caml version 3.00 # Hello World - : unit = () # 

  12. Hughes

    • 2018/11/7

    Object-oriented features are used much less frequently in OCaml than in those languages. OCaml has alternatives that are often more appropriate, such as modules and functors. Indeed, many OCaml programs do not use objects at all. 3.1 Classes and objects

  13. Sanders

    • 2019/4/10

    The methods to install OCaml utop in ubuntu in most of the online resources seem like kind of misleading users. The thing is when installing opam with sudo apt-get command there is no need to install OCaml again using same command because OCaml came with opam installation. so only thing you have to do is to correctly initialize the state of the opam which defines the OPAM root in your home folder.

    So if you have installed any OCaml earlier first remove them to avoid conflicts.

    sudo apt-get purge --auto-remove ocaml-source
    sudo apt-get purge opam

    then install opam.

    sudo add-apt-repository ppa:avsm/ppa
    sudo apt-get update
    sudo apt-get install opam

    initialize the state of the opam

    opam init

    if it shows a dependency missing warning try this commands,

    opam install depext
    opam depext conf-m4.1

    then verify ocaml installation,

    eval 'opam config env'

    install UTop then,

    opam install utop
    eval `opam config env`

    for detailed information and handle errors please refer this blog post.

  14. Louis

    • 2020/5/16

    Lists * * * <i> Topics: * lists * recursive functions on lists * pattern matching * tail recursion </i> * * * ## Lists An OCaml list is a sequence of values all of which 

  15. Sorrentino

    • 2017/9/14

    If finally raises an exception, then the exception Fun. Finally_raised is raised instead. protect can be used to enforce local invariants whether work () returns normally or raises an exception.

  16. Green

    • 2017/4/17

    The semantics for this is the same as in F# (probably because F# is based on OCaml):. function allows the use of pattern matching (i.e. | ), but 

  17. Demetrius

    • 2018/11/9

    OCaml, there is a mechanism for naming them as well. This is done with the keyword type. The simplest kind of type definition is an alias for a type that already exists. Suppose that we like int list's so much that we want to give them a shorter name. A type aliaslike this is easy to define:

  18. Landry

    • 2019/7/24

    OCaml Datatypes. COS 326 Since the types are equal, you can substitute the definition for O'Caml provides a general mechanism called a data type for.

  19. Hoxha

    • 2017/10/10

    I need to iterate through a list of lists in ocaml. How can i iterate through a list of lists comparing each element of each list to zero? If an element is greater than zero it returns false and stops the recursion. the function must have the signature: int list list -> bool. Please do not show me ways using "array." or the keyword "in".

  20. Major

    • 2018/11/8

    stackoverflow.com › questions › ocaml-extract-nth-element-of-a-tuple

  21. Nasir

    • 2019/10/16

    Ocaml is different from Java, you don't have a print on whatever you want. For exemple, to print a list you have to write it Because in ocaml you don't have only object. – V. Michel Oct 18 '15 at 19:41

  22. Forrest

    • 2018/8/5

    Since types are also something you can manipulate in OCaml, there is a is a traditional Lisp-style list type: a Lisp list is either nil (empty), or it is a cons, which 

  23. Gianni

    • 2017/9/7

    Tuples. A tuple is another kind of type in OCaml that programmers can define. Like records, it is a composite of other types of data. But instead of naming the components, they are identified by position. Here are some examples of tuples: (1,2,10) 1,2,10 (true, "Hello") ([1;2;3], (0.5,'X')) A tuple with two components is called a pair.

  24. Costa

    • 2017/7/8

    It is strongly and statically typed, but instead of using manually written type annotations, it infers types of expressions using Hindley-Milner algorithm. It makes type 

  25. Smith

    • 2016/11/18

    OCaml - List - Iterating through a list and displaying all elements inside Submitted by Mi-K on Wednesday, February 29, 2012 - 10:13am As you already saw it, creating a list in OCaml is not so difficult.

  26. Mordechai

    • 2018/2/24

    We've seen OCaml's type syntax because the interpreter uses it to tell you the type of every value, but due to type inference we typically don't have to write a type 

  27. Jesse

    • 2017/8/21

    Explicit Declaration of Type. You can explicit say what's your function input's type. Usually you don't need to, because ocaml can correctly infer it.

  28. Atlas

    • 2019/3/28

    caml.inria.fr › pub › docs › manual-ocaml › coreexamples

  29. Jesse

    • 2020/11/1

    OCaml Pros & Cons cons pros Poor Parallelism Support Non-concurrent garbage collector Poor multicore support means poor performance on today's computers. Automatic Memory Management "OCaml was an awesome tool in the late 1990s and, by 2004, many people were finding the OCaml

  30. Ronnie

    • 2017/4/23

    S : convert a string argument to OCaml syntax (double quotes, escapes). c : insert a This integer argument precedes immediately the argument to print.

  31. Bronson

    • 2015/4/8

    For example, OCaml's syntax is "optimized" for curried functions and chaining of "if then else" expressions without an "elif" keyword, and on the contrary it is not very good as supporting the partial application of the second argument of an infix operators, or to locally declare exceptions. – gasche Jun 14 '15 at 17:05

  32. Tyler

    • 2019/8/24

    To run ocaml code interactively in the command line, type ocaml in terminal to example of printing different types of values *) print_int (3 + 4);; 

  33. Kyree

    • 2020/10/31

    OCaml's type system can act as a refactoring tool, warning you of places The term algebraic data types is often used to describe a collection of types that 

  34. Ahmed

    • 2019/2/4

    OCaml interpreted the semicolon before print_string "ok " as sequencing it within the scope of the let expression, rather than after the entire if / then / else. As a result, print_string "ok " only runs when the else clause is executed.

  35. Hezekiah

    • 2018/11/26

    True, Ocaml has semicolons, although it's a little different given that you can construct deeply nested functional expressions without ever using 

  36. Bo

    • 2019/6/9

    Cppo is a preprocessor for programming languages that follow lexical rules compatible with OCaml including OCaml-style comments (* *). These include Ocamllex, Ocamlyacc, Menhir, and extensions of OCaml based on Camlp4, Camlp5, or ppx. Cppo should work with Bucklescript as well.

  37. Manuel

    • 2015/7/13

    ocaml.org › learn › tutorials › structure_of_ocaml_programs

  38. Dibra

    • 2018/4/7

    From the answer below and its comments, I feel 'a. is a kind of force forall thing.. 1. 'a. in function definition. let f:('a -> int) = fun x -> x + 1 (* correct *) Above is fine because OCaml is free to narrow down the type of f's parameter and replace 'a with int.

  39. Sawyer

    • 2016/11/2

    The whole point of programming in a functional language is to define functions. We've already seen OCaml's fun lambda expression, and we have seen how to 

  40. Killian

    • 2019/6/29

    This is a direct consequence of the independence between types and classes in OCaml: two unrelated classes may produce objects of the same type, and there is no way at the type level to ensure that an object comes from a specific class. However a possible encoding of friend methods is given in section 3.17.

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