syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"load_builtin(target_tuple).expect(\"built-in"}]}
source_snippet:                 load_builtin(target_tuple).expect("built-in target")
context_before:             TargetTuple::TargetTuple(ref target_tuple) => {
context_after:             }