syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"base"}]}
source_snippet:             base => bug!("Expected an upvar, found {:?}", base),
context_before:             HirPlaceBase::Upvar(upvar_id) => upvar_id.var_path.hir_id,
context_after:         };