matsadler

  Add support for bundle gem --ext=rust command.

    class Foo
      def foo=(object)
        puts "foo= called with #{object.inspect}"
        @foo = object
      end

      def foo
        puts "foo called"
        @foo
      end
    end

    puts "x || x = y"

    a = Foo.new

    a.foo || a.foo = 1
    a.foo || a.foo = 2

    puts "\nx = x || y"

    b = Foo.new

    b.foo = b.foo || 1
    b.foo = b.foo || 2

    puts "\nx ||= y"

    c = Foo.new

    c.foo ||= 1
    c.foo ||= 2

    x || x = y
    foo called
    foo= called with 1
    foo called

    x = x || y
    foo called
    foo= called with 1
    foo called
    foo= called with 1

    x ||= y
    foo called
    foo= called with 1
    foo called

    require "benchmark"

    n = 100_000
    Benchmark.bm(4) do |x|
      x.report("<<") do
        n.times do
          "aaaaa " << "bbbbbb " << "ccccc " << "ddddd " << "eeeee " << "fffff"
        end
      end

      x.report("join") do
        n.times do
          ["aaaaa", "bbbbbb", "ccccc", "ddddd", "eeeee", "fffff"].join(" ")
        end
      end
    end

               user     system      total        real
    <<     0.140000   0.000000   0.140000 (  0.143750)
    join   0.230000   0.000000   0.230000 (  0.228035)