syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"has_thread_local:"}]}
source_snippet:     has_thread_local: Option<bool> = (None, parse_opt_bool, [TRACKED],
context_before:         environment variable `RUSTC_GRAPHVIZ_FONT` (default: `Courier, monospace`)"),
context_after:         "explicitly enable the `cfg(target_thread_local)` directive"),