syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"\"a"}]}
source_snippet:         "a list of extra LLVM passes to run (space separated)"),
context_before:     passes: Vec<String> = (Vec::new(), parse_list, [TRACKED],
context_after:     prefer_dynamic: bool = (false, parse_bool, [TRACKED],