Sather - Programming language

Sather is a programming language created in 1990 by Steve Omohundro.

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Sather is an object-oriented programming language. It originated circa 1990 at the International Computer Science Institute (ICSI) at the University of California, Berkeley, developed by an international team led by Steve Omohundro. It supports garbage collection and generics by subtypes. Read more on Wikipedia...

Sather website
Sather Wikipedia page
Sather first developed in University of California, Berkeley and University of Waikato and GNU project
Explore Sather snippets on Rosetta Code
Sather on HOPL
Sather appears in the TIOBE Index
See also: (7 related languages)Eiffel, CLU, Common Lisp, Scheme, Classroom Object Oriented Language, Rust, C

Example from hello-world:

class MAIN is
   main is 
      loop 
         #OUT + "Hello World\n" 
      end 
   end
end

Example from the Hello World Collection:

-- Hello World in Sather

    class HELLO is
       main is #OUT + "Hello World!\n" end
    end

Example from Wikipedia:

upto!(once m:INT):SAME is
    i: INT := self; -- initialise i to the value of self, 
                    -- that is the integer of which this method is called
    loop
      if i>m then 
        quit;  -- leave the loop when i goes beyond m
      end;
      yield i; -- else use i as return value and stay in the loop
      i := i + 1; -- and increment
    end;
  end;