syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:         match self.ambient_variance {
context_before:     fn regions(&mut self, a: I::Region, b: I::Region) -> RelateResult<I, I::Region> {
context_after:             // Subtype(&'a u8, &'b u8) => Outlives('a: 'b) => SubRegion('b, 'a)