Check to see if #val# is a valid byte value
Check to see if #val# is a valid byte value. If not, generate an error message using #parser_error()#. There are two versions of #check_byte()#, one which calls #parser_error()# and prints an error message to stderr an one which calls #parser_error()# and generates and Error object. Returns: True if #val# is a byte value, False otherwise.
alphabetic index hierarchy of classes
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