syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Loop run #0: Stack after diving in is [D B A], A is "childless"
context_before:     // Starting point 0 stack [D]
context_after:     // after this point, all newly visited nodes won't have a vtable that equals to a prefix of this one.