syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"None"}]}
source_snippet:         None | Some("lib") => {
context_before:     match option_env!("CFG_LIBDIR_RELATIVE") {
context_after:             if sysroot.join(PRIMARY_LIB_DIR).join(RUST_LIB_DIR).exists() {