syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"real_rust_source_base_dir:"}]}
source_snippet:         real_rust_source_base_dir: Option<PathBuf> [TRACKED_NO_CRATE_HASH],
context_before:         /// (the `rust.remap-debuginfo` option in `bootstrap.toml`).