syntax_data: {"ast_node_type":"other","tokens":[{"end":105,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // is zero cost, and to another trait includes only replacing the pointer with one level indirection,
context_before:     // This has the advantage that trait upcasting to the first direct super trait on each level
context_after:     // while not using too much extra memory.