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Description
A variable definition with a value that ends with an unnamed ruleset, e.g.
@var: x {y: z};
is interpreted as an unknown at-rule, thus resulting in:
@var : x {
y: z;
}
This is most likely a result of #2783. (Before #2783, such code resulted in a error, i.e. it's not a regression but more like an overlooked side-effect).
See also related #2270 (comment).