syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // the child captures a field by ref, then for the by-move body we're
context_before:             // As noted before, if the parent closure captures a field by value, and
context_after:             // generating, we also are taking that field by value. Peel off a deref,