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Seen in https://github.com/Homebrew/homebrew-core/pull/241981/files#r2347675278

Prior to change, when trying:

on_intel do
  fails_with :gcc do
    version "11"
    cause "reason"
  end
end

brew audit outputs:

Nest `on_intel` blocks inside `fails_with` blocks when there is only one inner block.

Changing to:

fails_with :gcc do
  on_intel do
    version "11"
    cause "reason"
  end
end

brew audit outputs:

undefined method 'on_intel' for an instance of CompilerFailure

With PR change, the former now works.