syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//!"}]}
source_snippet: //! of source parsed during crate parsing (typically files, in-memory strings,
context_before: //! from integer byte positions to the original source code location. Each bit
context_after: //! or various bits of macro expansion) cover a continuous range of bytes in the