id	summary	reporter	owner	description	type	status	priority	component	severity	resolution	keywords	cc
200	should produce cleaner error message when processing documents containing tabs	liu.long@…	xi	"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"");
}}}
"	enhancement	new	normal	libyaml	normal		tab