Your environment

• Ruby version: 3.2
• rspec-mocks version: 3.12.2
• Rails version: main.

Steps to reproduce

In a Rails application (i.e., with Rails loaded), define a method expectation:

mock = instance_double("Hash")
allow(mock).to receive(:key?).with(:x) { 1 }

expect(mock.key?(:x)).to eq 1

Expected behavior

Pass.

Actual behavior

ArgumentError:
       wrong number of arguments (given 1, expected 0)
     # ../rails/activesupport/lib/active_support/core_ext/object/with.rb:24:in `with'

What happened?

Rails monkey-patched Object#with rails/rails#46681 /cc @byroot

RSpec receive matcher defines chain methods only for undefined methods:

Since #with is defined on Object, the with modifier is no longer available.