syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Loop run #0: Stack after exiting out is [D C], C is the next starting point.
context_before:     // Loop run #0: Emitting the slice [B A] (in reverse order), B has a next-sibling node, so this slice stops here.
context_after:     // Loop run #1: Stack after diving in is [D C], C is "childless", since its child A is skipped(already emitted).