syntax_data: {"ast_node_type":"variable","tokens":[{"end":71,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let [sub_branch] = branch.sub_branches.try_into().unwrap();
context_before:         if branch.sub_branches.len() == 1 {
context_after:             // Avoid generating another `BasicBlock` when we only have one sub branch.