syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                     if has_guard {
context_before:                     leaf_candidate.pre_binding_block = Some(new_pre_binding);
context_after:                         // Falsely branch to `next_candidate_start_block` also if the guard fails.