syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// * If this expr is a place expr like a.b, then we will return that place.
context_before:     /// place. The place itself may or may not be mutable:
context_after:     /// * Otherwise, a temporary is created: in that event, it will be an immutable temporary.