Function error

test/babel.js:49954–49967

(m)

	        return chr === '' ? 'EOF' : "'" + chr + "'";
	    },
	        error = function error(m) {

	        // Call error when something is wrong.

	        var error = new SyntaxError();
	        // beginning of message suffix to agree with that provided by Gecko - see https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse
	        error.message = m + " at line " + lineNumber + " column " + columnNumber + " of the JSON5 data. Still to read: " + JSON.stringify(text.substring(at - 1, at + 19));
	        error.at = at;
	        // These two property names have been chosen to agree with the ones in Gecko, the only popular
	        // environment which seems to supply this info on JSON.parse
	        error.lineNumber = lineNumber;
	        error.columnNumber = columnNumber;
	        throw error;
	    },
	        next = function next(c) {

	        // If a c parameter is provided, verify that it matches the current character.