syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Mutability note: The caller of this method promises only to read from the resulting
context_before:     /// intermediate `Place` values until we know the full set of projections.
context_after:     /// place. The place itself may or may not be mutable: