Mustermann::StringScanner::ScanResult#position

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@example
  require 'mustermann/string_scanner'
  scanner = Mustermann::StringScanner.new('foo/bar')
  scanner.scan(:name).position # => 0
  scanner.getch.position       # => 3
  scanner.scan(:name).position # => 4

@return [Integer] position the substring starts at
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