#!/usr/bin/env ruby
# Reproduction: JRuby incorrectly handles `...` forwarding through `super` to Struct#initialize.
#
# Expected behavior (CRuby 3.4): no warnings, no crashes.
# Actual behavior (JRuby 10.0.2.0):
#   - 1-member Struct: ClassCastException crash
#   - 2-member Struct: works fine
#   - 3+-member Struct: spurious "keyword arguments" warning
#
# Also affects `super(*args, **kwargs)` forwarding (3+ members warn).

$VERBOSE = true

module Wrapper
  def initialize(...)
    super(...)
  end
end

# --- Case 1: 1-member Struct crashes ---
puts "--- Case 1: 1-member Struct ---"
begin
  klass1 = Class.new(Struct.new(:a)) { prepend Wrapper }
  klass1.new("x")
  puts "OK"
rescue => e
  puts "CRASH: #{e.class}: #{e.message}"
end

# --- Case 2: 2-member Struct works ---
puts "--- Case 2: 2-member Struct ---"
klass2 = Class.new(Struct.new(:a, :b)) { prepend Wrapper }
klass2.new("x", "y")
puts "OK"

# --- Case 3: 3-member Struct warns ---
puts "--- Case 3: 3-member Struct ---"
klass3 = Class.new(Struct.new(:a, :b, :c)) { prepend Wrapper }
klass3.new("x", "y", "z")
puts "OK"

# --- Case 4: bare `super` in def initialize(...) also triggers ---
puts "--- Case 4: bare super variant ---"
module WrapperBare
  def initialize(...)
    super
  end
end
klass4 = Class.new(Struct.new(:a, :b, :c)) { prepend WrapperBare }
klass4.new("x", "y", "z")
puts "OK"

# --- Case 5: super(*args, **kwargs) also triggers ---
puts "--- Case 5: super(*args, **kwargs) ---"
module WrapperKwargs
  def initialize(*args, **kwargs)
    super(*args, **kwargs)
  end
end
klass5 = Class.new(Struct.new(:a, :b, :c)) { include WrapperKwargs }
klass5.new("x", "y", "z")
puts "OK"

# --- Workaround: *args, &block without **kwargs does not warn ---
puts "--- Workaround: *args, &block ---"
module WrapperFixed
  def initialize(*args, &block)
    super(*args, &block)
  end
end
klass6 = Class.new(Struct.new(:a, :b, :c)) { prepend WrapperFixed }
klass6.new("x", "y", "z")
puts "OK (no warning)"