syntax_data: {"ast_node_type":"other","tokens":[{"end":116,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Loop run #1: Stack after diving in is [D C], C is "childless", since its child A is skipped(already emitted).
context_before:     // Loop run #0: Stack after exiting out is [D C], C is the next starting point.
context_after:     // Loop run #1: Emitting the slice [D C] (in reverse order). No one has a next-sibling node.