syntax_data: {"ast_node_type":"variable","tokens":[{"end":46,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let (then_block, else_block) =
context_before:                 // We first evaluate the left-hand side of the predicate ...
context_after:                     this.in_if_then_scope(condition_scope, expr.span, |this| {