syntax_data: {"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// offsets into the `SourceMap`). Instead, we hash the (file name, line, column)
context_before:     /// fields (that would be similar to hashing pointers, since those are just
context_after:     /// triple, which stays the same even if the containing `SourceFile` has moved