syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"target_cpu:"}]}
source_snippet:     target_cpu: Option<String> = (None, parse_opt_string, [TRACKED],
context_before:         "which mangling version to use for symbol names ('legacy' (default), 'v0', or 'hashed')"),
context_after:         "select target processor (`rustc --print target-cpus` for details)"),