function toSource$1(func) {
	  if (func != null) {
	    try {
	      return funcToString$2.call(func);
	    } catch (e) {}
	    try {
	      return (func + '');
	    } catch (e) {}
	  }
	  return '';
	}
function toSource$1(func) {
	  if (func != null) {
	    try {
	      return funcToString$2.call(func);
	    } catch (e) {}
	    try {
	      return (func + '');
	    } catch (e) {}
	  }
	  return '';
	}
function toSource$1 ( func ) { if ( func != null ) { try { return funcToString$2 . call ( func ) ; } catch ( e ) { } try { return ( func + '' ) ; } catch ( e ) { } } return '' ; }
Converts `func` to its source code.

@private
@param {Function} func The function to process.
@returns {string} Returns the source code.
Converts func to its source code .