Save a string to a temporary variable during the parse.
Given a string (#const char *src#), save it to the temporary variable pointed to by #dst#. If the string is longer than #ID_MAX#, generate and error indicating that #src# was truncated to #ID_MAX# characters during the copy operation. There are two versions of this function; one calls the version of #parser_error()# which writes to stderr. The version which accepts the #parser_arg *arg# argument calls the version of #parser_error()# which generates and Error object.
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