syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"ConstValue::from_u128(u128::wrapping_sub(valid_range.end,"}]}
source_snippet:             ConstValue::from_u128(u128::wrapping_sub(valid_range.end, valid_range.start)),
context_before:         const_: Const::Val(
context_after:             tcx.types.u128,