syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // as a fallback.
context_before:                 // Additionally look in the sysroot under `lib/rustlib/<tuple>/target.json`
context_after:                 let rustlib_path = crate::relative_target_rustlib_path(sysroot, target_tuple);