hide StandaloneLevel

library/proc_macro/src/lib.rs

@@ -95,20 +95,25 @@ pub fn is_available() -> bool {
 /// `Never` to `FallbackOnly`.
 #[unstable(feature = "proc_macro_standalone", issue = "130856")]
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
-pub enum StandaloneLevel {
+enum StandaloneLevel {
     /// The standalone implementation is never used. This is the default.
     Never,
     /// The standalone implementation is only used outside of procedural macros.
     FallbackOnly,
     /// The standalone implementation is always used, even in procedural macros.
+    /// 
+    /// This does not actually work and should be removed before merging.
     Always,
 }
 
 /// Enables the new experimental standalone backend, which allows calling the
 /// functions in this crate outside of procedural macros.
+/// 
+/// When stabilizing this feature, this function will be removed and all programs 
+/// will have the fallback activated automatically.
 #[unstable(feature = "proc_macro_standalone", issue = "130856")]
-pub fn enable_standalone(level: StandaloneLevel) {
-    bridge::client::enable_standalone(level);
+pub fn enable_standalone() {
+    bridge::client::enable_standalone(StandaloneLevel::FallbackOnly);
 }
 
 /// The main type provided by this crate, representing an abstract stream of