syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"ControlFlow::Break(vec![ty::Bivariant;"}]}
source_snippet:                     ControlFlow::Break(vec![ty::Bivariant; n].leak())
context_before:                     let n = tcx.generics_of(def_id).own_params.len();
context_after:                 } else {