Use OnceCell instead of Once

Author: ecstatic-morse

clippy_lints/src/missing_inline.rs

@@ -71,7 +71,7 @@ fn check_missing_inline_attrs(cx: &LateContext<'_, '_>, attrs: &[ast::Attribute]
 fn is_executable(cx: &LateContext<'_, '_>) -> bool {
     use rustc_session::config::CrateType;
 
-    cx.tcx.sess.crate_types.get().iter().any(|t: &CrateType| match t {
+    cx.tcx.sess.crate_types().iter().any(|t: &CrateType| match t {
         CrateType::Executable => true,
         _ => false,
     })