syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"no_codegen:"}]}
source_snippet:     no_codegen: bool = (false, parse_no_value, [TRACKED_NO_CRATE_HASH],
context_before:         "parse and expand the source, but run no analysis"),
context_after:         "run all passes except codegen; no output"),