syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"return"}]}
source_snippet:                 return if new_ctxt32 <= MAX_CTXT {
context_before:                 let new_ctxt32 = new_ctxt.as_u32();
context_after:                     // Any small new context including zero will preserve the format.