syntax_data: {"ast_node_type":"variable","tokens":[{"end":34,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let return_block = builder
context_before:         let fn_end = span_with_body.shrink_to_hi();
context_after:             .in_breakable_scope(None, Place::return_place(), fn_end, |builder| {