[feature suggestion] Copy property value from a given selector

I was thinking that it would be great if we had a way of copying values from other properties by passing a selector. Here’s how I can imagine this being used:

.icon {
  content: "";
  display: inline-block;
  width: 16px;
  height: 18px;
  // Since the value is the same, we can just reference it.
  line-height: &.height;
}

// Referencing body values.
.my-content {
  background: body.background;
  color: body.color;
}

Or maybe having something like @value, IDK.

I know this can be accomplished by using variables but it could be useful anyway.

[lolmaus]

@SamHH #109 is still open, you can try adding your suggestion there.

[samhh]

@nex3 Closed and old issue I know, but I can’t find an open and relevant issue for this. Here’s an example of where Stylus bests Sass because of property lookup:

Sass:

$needless-var: 200px
.class
  width: $needless-var
  height: $needless-var

Stylus:

.class
  width: 200px
  height: @width

It’s not a big deal but I think it helps a lot with readability. Whereas with a var you can’t immediately visually grep how often a var is used (and what the consequences are of changing it), you can immediately tell with a property lookup that there is a direct connection between two properties that doesn’t affect anything else.