syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// the updated universe is not the root.
context_before:     /// In case this is a float or int variable, this causes an ICE if
context_after:     pub fn with_updated_universe(self, ui: UniverseIndex) -> CanonicalVarKind<I> {