Combination of option hash and keyword arguments causes crashes

[dorner]

Subject of the issue

When verified doubles are turned on, a particular combination of method arguments causes RSpec to crash - it gets confused with the method signature.

Your environment

• Ruby version: 3.0
• rspec-mocks version: 3.10.2

Steps to reproduce

Run the following file:

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'rspec'
end

require "rspec/autorun"

RSpec.configure do |config|
  config.mock_with :rspec do |mocks|
    mocks.verify_partial_doubles = true
  end
end

module MyModule
  def self.my_func(arg1, arg2, options={}, kw: false)
  end
end

RSpec.describe MyModule do
  it 'should pass' do
    allow(MyModule).to receive(:my_func).and_return('hi mom')
    MyModule.my_func(1, 2, { foo: 'bar', baz: 'eggs' })
  end
end

Expected behavior

The spec should pass.

Actual behavior

Fails with the following error:

     Failure/Error: MyModule.my_func(1, 2, { foo: 'bar', baz: 'eggs' })
     
     ArgumentError:
       Invalid keyword arguments provided: foo, baz

Note that if you replace the call by explicitly calling the keyword argument and not relying on the default, the spec passes: MyModule.my_func(1, 2, { foo: 'bar', baz: 'eggs' }, kw: false)