syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"ExprKind::UpvarRef"}]}
source_snippet:             ExprKind::UpvarRef { closure_def_id, var_hir_id } => {
context_before:             ),
context_after:                 this.lower_captured_upvar(block, closure_def_id.expect_local(), var_hir_id)