syntax_data: {"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Setting this activates caching.
context_before:     //
context_after:     pub fn thinlto_codegen_set_cache_dir(cg: thinlto_code_gen_t, cache_dir: *const ::libc::c_char);