foo(&a)
foo(&a)
foo(a, b.c, &d.e)
foo(
  a,
  # 0
  b,
  # 1
  &block # 2
  # 3
) # 4
foo a,
  b,
  # c
  &c

def foo(&)
  a(&)
  b(
    # 1
    & # 2
    # 3
  )
  c(x, *xs, y:, **yz, &)
end

foo {}
foo do end

foo {
}
foo do
end

foo {
  1
}
foo do
  1
end

foo do
  nil
end

foo do # do
  1
end

foo do # do
end

foo do
  1
  # 2
end

foo do
  # foo
end

a&.foo(1, "abc") do
  true
end

foo.bar(1).baz(2, 3) do
  nil
end

foo(1) do
  nil
end.bar(2).baz(3, 4)

foo(1)
  .bar do
    2
  end
  .baz(3) do
    4
  end

foo.flat_map(&:get_some_value_of_foo).filter(&:really_foo?).sum { |value|
  quantify_something_from(value)
}

foo(
  # 1
  a,
) do
  b
end

foo 1, 2, 3 do
  4
end

foo a,
  # 1
  b do
  c
end

foo { |a, b| a(b).c } # trailing

[[1, 2]].collect { |x,| x }
foo do |a, b,|
end

foo do |a, b| # c
  nil
end

foo do |p1, p2, p3 = 3, *ps, p4, k1:, k2:, k3: 3, **ks, &block|
end

foo do |
  p1,
  p2,
  p3 = 3,
  k1:,
  k2: 3 # 3
|
  true
end

foo do |*, **|
end

foo do |
  a,
  # b
  b
|
  c
end

foo do |
  # a
  a,
  # b
  b,
|
end

foo do # do
  |
    # 1
    # 2
    # 3
    a,
    # 4
    b # 5
    # 6
  | # 7
  # 8
  2
end

foo do |; a, b|
end

foo do |a, b; c, d| # e
end

foo do |a, b,; c, d| # e
end

foo do |
  ;
  c # c
|
  1
end

foo do |
  a,
  b, # 1
  ;
  # 2
  # 3
  c # 4
|
  1
end

foo { _1 + _2 }
foo do
  _1.foo(_2)
end

foo do # 0.5
  1
rescue # 1.5
  2
rescue Foo => foo # 2.5
  3
else # 3.5
  4
ensure # 4.5
  5
end

Foo.transaction do
  p 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
end

if true
  aaaaaaaaaaaa.bbbbbbbbbbbbbbbbbb(:xx, :yy, :zz).cccccccc(1, 2, 3).ddddddddd('e').each do |item|
    item.foo.bar&.baz || :qux
  end
  aaaaaaaaaaaa.bbbbbbbbbbbbbbbbbb(:xx, :yy, :zz).cccccccc(1, 2, 3).ddddddddd('eeeeeee').each do |
    item
  |
    item.foo.bar&.baz || :qux
  end
  aaaaaaaaaaaa
    .bbbbbbbbbbbbbbbbbb(:xx, :yy, :zz)
    .cccccccc(1, 2, 3)
    .ddddddddd('eeeeeeeeeeeeeeeeeeeeeeeeeee')
    .each do |item|
      item.foo.bar&.baz || :qux
    end
end