syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // This is the location used by the `rustc-dev` `rustup` component.
context_before:     let real_rustc_dev_source_base_dir =
context_after:         real_source_base_dir("lib/rustlib/rustc-src/rust", "compiler/rustc/src/main.rs");