syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// * `x = 0` is encoded as just the `"_"` terminator
context_before:     /// specified in the RFC as `<base-62-number>`, that is:
context_after:     /// * `x > 0` is encoded as `x - 1` in base 62, followed by `"_"`,