RedundantBlockCall false positive with nested blocks

[vlad-pisanov]

When the block argument is shadowed by a nested block argument, RedundantBlockCall cop is triggered. Consider:

def false_positive(&block)
  proc { p 'hi' }.then do |block|
    block.call
  end
end

The above triggers the cop. It gets wrongly auto-corrected to:

def false_positive()
  proc { p 'hi' }.then do |_block|
    yield
  end
end

(however, regular shadowed variables are correctly handled and don't trigger the cop):

def works(&block)
  block = proc { p 'hi' }
  block.call
end

---

Expected behavior

Should not trigger RedundantBlockCall

Actual behavior

Performance/RedundantBlockCall: Use yield instead of block.call

Steps to reproduce the problem

Run the false_positive code

RuboCop version

0.89.1 (using Parser 2.7.1.4, rubocop-ast 0.3.0, running on ruby 2.4.5 x86_64-darwin19)