syntax_data: {"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":"CoroutineLayout<'tcx>,"}]}
source_snippet:     CoroutineLayout<'tcx>,
context_before:     IndexVec<Local, Option<(Ty<'tcx>, VariantIdx, FieldIdx)>>,
context_after:     IndexVec<BasicBlock, Option<DenseBitSet<Local>>>,