last_error

Returns an exception object for the last conversion. Returns nil if the last conversion did not produce an error.

“error” means that Encoding::InvalidByteSequenceError and Encoding::UndefinedConversionError for Encoding::Converter#convert and :invalid_byte_sequence, :incomplete_input and :undefined_conversion for Encoding::Converter#primitive_convert.

ec = Encoding::Converter.new(“utf-8”, “iso-8859-1”) p ec.primitive_convert(src=“xf1abcd”, dst=“”) #=> :invalid_byte_sequence p ec.last_error #=> # “xF1” followed by “a” on UTF-8> p ec.primitive_convert(src, dst, nil, 1) #=> :destination_buffer_full p ec.last_error #=> nil