syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"upvars:"}]}
source_snippet:     upvars: CaptureMap<'tcx>,
context_before:     canonical_user_type_annotations: ty::CanonicalUserTypeAnnotations<'tcx>,
context_after:     unit_temp: Option<Place<'tcx>>,