Add long error explanation for E0575

Author: GuillaumeGomez

src/librustc_resolve/error_codes.rs

@@ -1735,6 +1735,59 @@ match eco {
 ```
 "##,
 
+E0575: r##"
+Something other than a type or an associated type was given.
+
+Erroneous code example:
+
+```compile_fail,E0575
+enum Rick { Morty }
+
+let _: <u8 as Rick>::Morty; // error!
+
+trait Age {
+    type Empire;
+    fn Mythology() {}
+}
+
+impl Age for u8 {
+    type Empire = u16;
+}
+
+let _: <u8 as Age>::Mythology; // error!
+```
+
+In both cases, we're declaring a variable (called `_`) and we're giving it a
+type. However, `<u8 as Rick>::Morty` and `<u8 as Age>::Mythology` aren't types,
+therefore the compiler throws an error.
+
+`<u8 as Rick>::Morty` is an enum variant, you cannot use a variant as a type,
+you have to use the enum directly:
+
+```
+enum Rick { Morty }
+
+let _: Rick; // ok!
+```
+
+`<u8 as Age>::Mythology` is a trait method, which is definitely not a type.
+However, the `Age` trait provides an associated type `Empire` which can be
+used as a type:
+
+```
+trait Age {
+    type Empire;
+    fn Mythology() {}
+}
+
+impl Age for u8 {
+    type Empire = u16;
+}
+
+let _: <u8 as Age>::Empire; // ok!
+```
+"##,
+
 E0603: r##"
 A private item was used outside its scope.
 
@@ -1862,7 +1915,6 @@ struct Foo<X = Box<Self>> {
 //  E0427, merged into 530
 //  E0467, removed
 //  E0470, removed
-    E0575,
     E0576,
     E0577,
     E0578,