Error using virtuals in VFL statements

[paulyoung]

The following VFL results in Uncaught Error: GssQuery must have a selector

@virtual "platform";
@h |-["platform"]-| outer-gap([padding]) in(#platform);

[paulyoung]

This CCSS results in the same error:

"platform"[left] == #platform[left] + [padding];
"platform"[right] == #platform[right] + [padding];

[paulyoung]

This is preventing me from doing:

@virtual "spacer";

@h|-["spacer"]-[#platform-first-p]-[#platform-second-p]-|
    gap([margin])
    outer-gap([padding])
    in(#platform);