syntax_data: {"ast_node_type":"variable","tokens":[{"end":57,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let mu = Ty::new_maybe_uninit(tcx, tcx.types.u8);
context_before:         // [MaybeUninit; N] and then index into it.
context_after:         let array_len = op_size.bytes();