syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"Some(\"non-leaf\")"}]}
source_snippet:             Some("non-leaf") => slot.ratchet(FramePointer::NonLeaf),
context_before:             Some("always") => slot.ratchet(FramePointer::Always),
context_after:             _ => return false,