syntax_data: {"ast_node_type":"import","tokens":[{"end":82,"kind":"keyword","start":0,"text":"\"choose"}]}
source_snippet:         "choose the code model to use (`rustc --print code-models` for details)"),
context_before:     code_model: Option<CodeModel> = (None, parse_code_model, [TRACKED],
context_after:     codegen_units: Option<usize> = (None, parse_opt_number, [UNTRACKED],