syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"tune_cpu:"}]}
source_snippet:     tune_cpu: Option<String> = (None, parse_opt_string, [TRACKED],
context_before:         "in diagnostics, use heuristics to shorten paths referring to items"),
context_after:         "select processor to schedule for (`rustc --print target-cpus` for details)"),