fix Boxed types

src/autotraits.rs

@@ -0,0 +1,11 @@
+#![allow(suspicious_auto_trait_impls)]
+
+pub auto trait NotNothing {}
+impl !NotNothing for super::Nothing {}
+
+pub auto trait NotAnything {}
+impl !NotAnything for super::Anything {}
+
+impl <T> NotNothing for alloc::boxed::Box<T> {}
+impl <T> NotAnything for alloc::boxed::Box<T> {}
+

src/lib.rs

@@ -8,15 +8,14 @@ use alloc::format;
 use alloc::string::String;
 use core::fmt::{Debug, Display, Formatter};
 use core::any::Any;
+use crate::autotraits::{NotAnything, NotNothing};
 
+mod autotraits;
 
 // ==============================
 //           Anything
 // ==============================
 
-auto trait NotAnything {}
-impl !NotAnything for Anything {}
-
 pub struct Anything {
     error: Box<dyn DynError>,
 
@@ -118,12 +117,11 @@ impl<T: Any + NotAnything + Debug > DynError for T {
     }
 }
 
+
 // ==============================
-//           Anything
+//           Nothing
 // ==============================
 
-auto trait NotNothing {}
-impl !NotNothing for Nothing {}
 
 #[derive(Debug)]
 pub struct Nothing;
@@ -131,4 +129,3 @@ pub struct Nothing;
 impl<T: NotNothing> From<T> for Nothing {
     fn from(_: T) -> Self { Nothing }
 }
-

tests/test.rs

@@ -15,10 +15,37 @@ pub fn func_3() -> Result<(),Nothing> {
     Ok(())
 }
 
+fn func_4() -> Anything {
+    let a= std::io::Error::last_os_error();
+    Anything::from(a)
+}
+
+fn func_5() -> Result<(), Anything> {
+    fn func_5a() -> Result<(), Anything> {
+        fn func_5b() -> Result<(), Anything> {
+            fn func_5c() -> Result<(), Anything> {
+                fn func_5d() -> Result<(), Anything> {
+                    Err("Hello World")?;
+                    Ok(())
+                }
+                func_5d()?;
+                Ok(())
+            }
+            func_5c()?;
+            Ok(())
+        }
+        func_5b()?;
+        Ok(())
+    }
+    func_5a()?;
+    Ok(())
+}
 
 #[test]
 pub fn test() {
-    println!("{:?}", func_1().unwrap_err());
+    println!("func1: {:?}\n", func_1().unwrap_err());
-    println!("{:?}", func_2().unwrap_err());
+    println!("func2: {:?}\n", func_2().unwrap_err());
-    println!("{:?}", func_3().unwrap_err());
+    println!("func3: {:?}\n", func_3().unwrap_err());
+    println!("func4: {:?}\n", func_4());
+    println!("func5: {:?}\n", func_5().unwrap_err());
 }