syntax_data: {"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let ty::Coroutine(_, cor_args) = ty.kind() else {
context_before:         } else if let ty::InstanceKind::AsyncDropGlue(_, ty) = instance.def {
context_after:                 bug!();