syntax_data: {"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! or various bits of macro expansion) cover a continuous range of bytes in the
context_before: //! of source parsed during crate parsing (typically files, in-memory strings,
context_after: //! `SourceMap` and are represented by [`SourceFile`]s. Byte positions are stored in