syntax_data: {"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let comma = if matches!(only_body.kind, ExprKind::Block { .. })
context_before:             let only_body = &thir[only.body];
context_after:                 && only.span.eq_ctxt(only_body.span)