syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"\"don't"}]}
source_snippet:         "don't steal the THIR when we're done with it; useful for rustc drivers (default: no)"),
context_before:     no_steal_thir: bool = (false, parse_bool, [UNTRACKED],
context_after:     no_trait_vptr: bool = (false, parse_no_value, [TRACKED],