anchor.diff:  }
   
   expectFail(ex, int line, int column, [String msgStartsWith]) {
  -		expect(ex, isFormatException);
   		expect(ex is MustacheFormatException, isTrue);
   		if (line != null)
   			expect(ex.line, equals(line));
  
positive.code: 			var ex = renderFail(
  				'{{#section}}_{{var}}_{{/section}}',
  				{"section": 42});
  			expect(ex is FormatException, isTrue);
  			expect(ex.message, startsWith(BAD_VALUE_SECTION));
  		});
  		test('True', () {
  
negative.code: 			var ex = renderFail(
  				'{{^section}}_{{var}}_{{/section}}',
  				{"section": 42});
  			expect(ex is MustacheFormatException, isTrue);
  			expect(ex.message, startsWith(BAD_VALUE_INV_SECTION));
  		});
  		test('True', () {
  