syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"scalar.valid_range_mut().start"}]}
source_snippet:                         scalar.valid_range_mut().start = extract_const_value(cx, ty, start)?
context_before:                     {
context_after:                             .try_to_bits(tcx, cx.typing_env)