Mercury - Programming language

Mercury is an open source programming language created in 1995 by Zoltan Somogyi.

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Mercury is a functional logic programming language made for real-world uses. The first version was developed at the University of Melbourne, Computer Science department, by Fergus Henderson, Thomas Conway, and Zoltan Somogyi, under Somogyi's supervision, and released on April 8, 1995. Mercury is a purely declarative logic programming language. Read more on Wikipedia...

Tags: programming language
There are at least 715 Mercury repos on GitHub
Early development of Mercury happened in University of Melbourne
Mercury compiles to C
The Google BigQuery Public Dataset GitHub snapshot shows 594 users using Mercury in 646 repos on GitHub
There are 348 members in the Mercury subreddit
Explore Mercury snippets on Rosetta Code
Mercury on HOPL
Mercury appears in the TIOBE Index
GitHub supports syntax highlighting for Mercury
mercurylang.org was registered in 2011
See also: (26 related languages) Autocode, Mercurial, IA-32, ARM, Unix, Linux, Solaris, FreeBSD, Android, Prolog, HOPE, Haskell, C, Java, C#, Erlang, Assembly language, CIL, Vim, Emacs, Eclipse, Curry, Alice, Standard ML, Oz, Visual Prolog

Example from hello-world:

:- module hello.
:- interface.
:- import_module io.
:- pred main(io::di, io::uo) is det.

:- implementation.
main(!IO) :-
	io.write_string("Hello World\n", !IO).

Example from Linguist:

% "Hello World" in Mercury.

% This source file is hereby placed in the public domain.  -fjh (the author).

:- module hello.
:- interface.
:- import_module io.

:- pred main(io::di, io::uo) is det.

:- implementation.

main(!IO) :-
	io.write_string("Hello, world\n", !IO).

Example from Wikipedia:

:- module fib.
 :- interface.
 :- import_module io.
 :- pred main(io::di, io::uo) is det.
 
 :- implementation.
 :- import_module int.

 :- func fib(int) = int.
 fib(N) = (if N =< 2 then 1 else fib(N - 1) + fib(N - 2)).

 main(!IO) :-
        io.write_string("fib(10) = ", !IO),
        io.write_int(fib(10), !IO),
        io.nl(!IO).
        % Could instead use io.format("fib(10) = %d\n", [i(fib(10))], !IO).

Language features

Feature	Supported	Example	Token
Strings	✓	"Hello world"	"
Print() Debugging	✓		io.write_string
Comments	✓	% A comment
Line Comments	✓	% A comment	%
Semantic Indentation	X