syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"uninit_const_chunk_threshold:"}]}
source_snippet:     uninit_const_chunk_threshold: usize = (16, parse_number, [TRACKED],
context_before:         "emit compiler diagnostics in a form suitable for UI testing (default: no)"),
context_after:         "allow generating const initializers with mixed init/uninit chunks, \