description function in error trait is deprecated

Author: yerke

src/error/multiple_error_types/wrap_error.md

@@ -29,14 +29,6 @@ impl fmt::Display for DoubleError {
 }
 
 impl error::Error for DoubleError {
-    fn description(&self) -> &str {
-        match *self {
-            DoubleError::EmptyVec => "empty vectors not allowed",
-            // This already impls `Error`, so defer to its own implementation.
-            DoubleError::Parse(ref e) => e.description(),
-        }
-    }
-
     fn cause(&self) -> Option<&error::Error> {
         match *self {
             DoubleError::EmptyVec => None,