added hidden nonexaustive variant

fixes #182

Author: tinaun

CHANGELOG.md

@@ -3,6 +3,7 @@
 - Change last rust version supported to 1.14
 - [Cache whether RUST_BACKTRACE is enabled in a relaxed atomic static.](https://github.com/rust-lang-nursery/error-chain/pull/210)
 - [Mask the `quick_error` macro from the doc](https://github.com/rust-lang-nursery/error-chain/pull/210)
+- [Make generated `ErrorKind` enums non-exhaustive](https://github.com/rust-lang-nursery/error-chain/pull/193)
 
 # 0.11.0-rc.2
 
@@ -27,7 +28,7 @@
 
 # 0.8.1
 
-- Add crates.io categorie.
+- Add crates.io category.
 
 # 0.8.0
 

src/impl_error_chain_kind.rs

@@ -201,6 +201,9 @@ macro_rules! impl_error_chain_kind {
                 $(#[$imeta])*
                 $iitem $(($( $ttyp ),*))* $({$( $svar: $styp ),*})*,
             )*
+
+            #[doc(hidden)]
+            __Nonexhaustive {}
         }
     };
     // Private enum (Queue Empty)
@@ -279,6 +282,8 @@ macro_rules! impl_error_chain_kind {
                             display_fn(self, fmt)
                         }
                     )*
+
+                    _ => Ok(())
                 }
             }
         }
@@ -326,6 +331,8 @@ macro_rules! impl_error_chain_kind {
                                 {$( $funcs )*})
                         }
                     )*
+
+                    _ => "",
                 }
             }
         }

src/lib.rs

@@ -348,6 +348,7 @@
 //! match Error::from("error!") {
 //!     Error(ErrorKind::InvalidToolchainName(_), _) => { }
 //!     Error(ErrorKind::Msg(_), _) => { }
+//!     _ => { }
 //! }
 //! # }
 //! ```

tests/tests.rs

@@ -485,7 +485,8 @@ fn error_patterns() {
 
     // Tuples look nice when matching errors
     match Error::from("Test") {
-        Error(ErrorKind::Msg(_), _) => {}
+        Error(ErrorKind::Msg(_), _) => {},
+        _ => {},
     }
 }