syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // [MaybeUninit; N] and then index into it.
context_before:         // The discriminant is less wide than the operand, cast the operand into
context_after:         let mu = Ty::new_maybe_uninit(tcx, tcx.types.u8);