syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // This is the location used by the `rust-src` `rustup` component.
context_before:     let real_rust_source_base_dir =
context_after:         real_source_base_dir("lib/rustlib/src/rust", "library/std/src/lib.rs");