syntax_data: {"ast_node_type":"other","tokens":[{"end":40,"kind":"keyword","start":0,"text":"ty::UpvarCapture::ByUse"}]}
source_snippet:             ty::UpvarCapture::ByUse => {
context_before:             ty::UpvarCapture::ByValue => captured_place_expr,
context_after:                 let span = captured_place_expr.span;