syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // FIXME(higher_ranked_auto): We probably should deeply resolve these before
context_before:                 .map(|(o, _)| o)
context_after:                 // filtering out infers which only correspond to unconstrained infer regions