syntax_data: {"ast_node_type":"variable","tokens":[{"end":32,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let terminator =
context_before:                 let fail_block = target_block(TestBranch::Failure);
context_after:                     TerminatorKind::if_(Operand::Copy(place), success_block, fail_block);