syntax_data: {"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let fun_ty = body.exprs[*fun].ty;
context_before:         ExprKind::Call { fun, args, .. } => {
context_after:             let fun = recurse_build(tcx, body, *fun, root_span)?;