syntax_data: {"ast_node_type":"function","tokens":[{"end":75,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn xform(self, other: VarianceDiagInfo<I>) -> VarianceDiagInfo<I> {
context_before:     /// and new `VarianceDiagInfo`s when our variance changes.
context_after:         // For now, just use the first `VarianceDiagInfo::Invariant` that we see