& cannot be used in variable selectors

[danielrentz]

minimal example:

.mixin(@selector) { @{selector} { color: red; } }
div { .mixin("> span"); .mixin("&"); }

resolves to
div > span { color: red; }
instead of
div > span { color: red; }
div { color: red; }

[seven-phases-max]

I'm not closing this as there's not dedicated issue but essentially it's the same thing as #2079 (i.e. duplicate of #1421).
Currently Less does not evaluate the contents of a variable used for selector interpolation but just expands the variable "as is" (i.e. no special symbols like comma or & have any meaning there).

[seven-phases-max]

Closing as duplicate of #1546.