syntax_data: {"ast_node_type":"variable","tokens":[{"end":95,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let lhs_then_block = this.then_else_break_inner(block, lhs, args).into_block();
context_before:                 this.visit_coverage_branch_operation(op, expr_span);
context_after:                 let rhs_then_block =