syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"OptionsTargetModifiers::UnstableOptions(UnstableOptionsTargetModifiers::retpoline),"}]}
source_snippet:             OptionsTargetModifiers::UnstableOptions(UnstableOptionsTargetModifiers::retpoline),
context_before:         target_modifiers.insert(
context_after:             "true".to_string(),