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/opt/alt/ruby27/share/doc/alt-ruby27-doc/syntax/

//opt/alt/ruby27/share/doc/alt-ruby27-doc/syntax/comments.rdoc

 = Code Comments

Ruby has two types of comments: inline and block.

Inline comments start with the <code>#</code> character and continue until the
end of the line:

  # On a separate line
  class Foo # or at the end of the line
    # can be indented
    def bar
    end
  end

Block comments start with <code>=begin</code> and end with <code>=end</code>.
Each should start on a separate line.

  =begin
  This is
  commented out
  =end

  class Foo
  end

  =begin some_tag
  this works, too
  =end

<code>=begin</code> and <code>=end</code> can not be indented, so this is a
syntax error:

  class Foo
    =begin
    Will not work
    =end
  end