error_char

        # Encoding::UndefinedConversionError.error_char

(from ruby core)
### Implementation from UndefinedConversionError
---
    ecerr.error_char         -> string

---

Returns the one-character string which cause
Encoding::UndefinedConversionError.

    ec = Encoding::Converter.new("ISO-8859-1", "EUC-JP")
    begin
      ec.convert("\xa0")
    rescue Encoding::UndefinedConversionError
      puts $!.error_char.dump   #=> "\xC2\xA0"
      p $!.error_char.encoding  #=> #<Encoding:UTF-8>
    end