syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// encoded. This makes for much faster decoding. Besides, the
context_before:     /// encodes one little-endian diff. Note that they aren't LEB128
context_after:     /// bytes_per_diff==1 case is by far the most common, and LEB128