ParseError: Unrecognised input. Possibly missing something

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1、错误描述

[编译less] 09:26:37.183 [31mParseError: Unrecognised input. Possibly missing something[39m[31m in [39mG:\HBuilderXWork\ES6\less\c.less[90m on line 8, column 27:[39m
[编译less] 09:26:37.183 [90m7 [39m
[编译less] 09:26:37.183 8 .cut-color:extend(.you tr)[7m[31m[1m;[22m[39m[27m[0m[0m

2、错误原因

      extend后面少了一对{ }

.you{
	tr{
		background: #565656;
		color: #0000FF;
	}
}

.cut-color:extend(.you tr);

3、解决办法

.you{
	tr{
		background: #565656;
		color: #0000FF;
	}
}

.cut-color:extend(.you tr) { }