When could the extend method use a mixin as a parameter?

[totoro118]

When could the extend method use a function as a parameter? For example:

.size (@width: 20, @height: 20) {
    width: @width;
    height: @height;
}
.box {
    &:extend(size(50, 50));
}

My Email:963983501@qq.com

[seven-phases-max]

See #1177.

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And please use backticks to format your code.

[seven-phases-max]

Closing as duplicate of #1177.

[totoro118]

The syntax is dead, but we are alive, the syntax should be changed with the requirement.

[seven-phases-max]

@totoro118

I'm not sure I understand what you mean with dead/alive but for your specific example see #1177 (comment).