syntax_data: {"ast_node_type":"other","tokens":[{"end":14,"kind":"keyword","start":0,"text":"_"}]}
source_snippet:         _ => {
context_before:         // Other usages of null pointers only are UB if the pointee is not a ZST.
context_after:             let rvalue = Rvalue::NullaryOp(NullOp::SizeOf, pointee_ty);