Fix raise signature for Ruby < 3.2

In Ruby versions older than 3.2, objects that respond to `#to_hash` are always used to extract keyword arguments from when `**kwargs` is present in a method signature. It causes these objects to be passed in as a hash to the `raise` method instead of an object. 

Code like `raise CustomError, object_implementing_to_hash`, which relies on `object_implementing_to_hash` to be an object, no longer works.

In this commit we ensure above code keeps working until keyword arguments are fixed in Ruby 3.2.

lib/spring/application.rb

@@ -302,13 +302,26 @@ def shush_backtraces
  Kernel.module_eval do
  old_raise = Kernel.method(:raise)
  remove_method :raise
- define_method :raise do |*args, **kwargs|
- begin
- old_raise.call(*args, **kwargs)
- ensure
- if $!
- lib = File.expand_path("..", __FILE__)
- $!.backtrace.reject! { |line| line.start_with?(lib) } unless $!.backtrace.frozen?
+ if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('3.2.0')
+ define_method :raise do |*args, **kwargs|
+ begin
+ old_raise.call(*args, **kwargs)
+ ensure
+ if $!
+ lib = File.expand_path("..", __FILE__)
+ $!.backtrace.reject! { |line| line.start_with?(lib) } unless $!.backtrace.frozen?
+ end
+ end
+ end
+ else
+ define_method :raise do |*args|
+ begin
+ old_raise.call(*args)
+ ensure
+ if $!
+ lib = File.expand_path("..", __FILE__)
+ $!.backtrace.reject! { |line| line.start_with?(lib) } unless $!.backtrace.frozen?
+ end
  end
  end
  end