syntax_data: {"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let discr = local_decls.push(LocalDecl::with_source_info(const_u128, source_info)).into();
context_before:     let rvalue = Rvalue::Cast(CastKind::IntToInt, Operand::Copy(discr_in_discr_ty), const_u128);
context_after:     block_data