syntax_data: {"ast_node_type":"other","tokens":[{"end":36,"kind":"keyword","start":0,"text":"\"profile"}]}
source_snippet:         "profile size of closures"),
context_before:     profile_closures: bool = (false, parse_no_value, [UNTRACKED],
context_after:     profile_sample_use: Option<PathBuf> = (None, parse_opt_pathbuf, [TRACKED],