should produce cleaner error message when processing documents containing tabs

[liu.long@…]

I am facing a problem while trying to execute a program taking YAML documents as input, and get the following error message (This error occurs when libyaml finds unparsable yaml files, in this case a Tab character used for indenting.):

The error is thrown in the 7th line as: Error: YAML syntax error - found character that cannot start any token while scanning for the next token, at line 7

Instead, I need some message like this: Error: YAML syntax error - found a tab character where intendation spaces are expected while scanning for the next token, at line 7

Tab errors, as far as I know, is very common in YAML documents, it will help a lot. In fact, the problem is very easy to fix, just add a few lines in scanner.c, line 1041:

/* Is it a tab? */
    
if (CHECK(parser->buffer, '\t'))
    return yaml_parser_set_scanner_error(parser,
    	    "while scanning for the next token", parser->mark,
	    "found a tab character where intendation spaces are expected");