syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // which fits in `u8`, the smallest possible `unsigned_ty`.
context_before:                 // This can't overflow because the largest shiftable types are 128-bit,
context_after:                 let lhs_bits = Operand::const_from_scalar(