syntax_data: {"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let switch = TerminatorKind::SwitchInt { discr: Operand::Move(discr), targets: switch_targets };
context_before:         SwitchTargets::new(cases.iter().map(|(i, bb)| ((*i) as u128, *bb)), default_block);