False positive for IfUnlessModifier with pattern matching

[mehanoid]

If an if condition contains a pattern matching with a variable assignment, rubocop may erroneously suggest changing this code to use an if modifier, but the changed code does not work.

---

Expected behavior

No offences, no autocorrection

Actual behavior

For /home/meh/Projects/sandbox: Default configuration from /home/meh/.rbenv/versions/3.2.1/lib/ruby/gems/3.2.0/gems/rubocop-1.48.1/config/default.yml
Use parallel by default.
Skipping parallel inspection: only a single file needs inspection
Inspecting 1 file
Scanning /home/meh/Projects/sandbox/rubocop_pattern_match.rb
C

Offenses:

rubocop_pattern_match.rb:3:1: C: [Correctable] Style/IfUnlessModifier: Favor modifier if usage when having a single-line body. Another good alternative is the usage of control flow &&/||.
if [1] in [x]
^^

1 file inspected, 1 offense detected, 1 offense autocorrectable
Finished in 0.1424515729995619 seconds

Code after autocorrection:

# frozen_string_literal: true

puts x if [1] in [x]

This code does not work because the variables declared to the right of if are not visible to the code to the left of if. As a result, we get an error:

undefined local variable or method `x' for main:Object (NameError)

puts x if [1] in [x]
     ^

Steps to reproduce the problem

# frozen_string_literal: true

if [1] in [x]
  puts x
end

RuboCop version

$ rubocop -V
1.48.1 (using Parser 3.2.1.0, rubocop-ast 1.27.0, running on ruby 3.2.1) [x86_64-linux]