syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"TargetTuple::TargetTuple(ref"}]}
source_snippet:             TargetTuple::TargetTuple(ref target_tuple) => {
context_before:         match *target_tuple {
context_after:                 // check if tuple is in list of built-in targets