syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"ty::UpvarCapture::ByValue"}]}
source_snippet:             ty::UpvarCapture::ByValue => captured_place_expr,
context_before:         match upvar_capture {
context_after:             ty::UpvarCapture::ByUse => {