syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // Any small new context including zero will preserve the format.
context_before:                 return if new_ctxt32 <= MAX_CTXT {
context_after:                     InlineCtxt::span(span.lo, span.len, new_ctxt32 as u16)