syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"\"seed"}]}
source_snippet:         "seed layout randomization"),
context_before:     layout_seed: Option<u64> = (None, parse_opt_number, [TRACKED],
context_after:     link_directives: bool = (true, parse_bool, [TRACKED],