More general ErrorKind::Msg creation.

Author: Yamakaky

src/lib.rs

@@ -426,16 +426,9 @@ macro_rules! error_chain {
             }
         }
 
-        impl<'a> From<&'a str> for $error_name {
-            fn from(s: &'a str) -> Self {
-                $error_name(s.into(),
-                            (None, $crate::make_backtrace()))
-            }
-        }
-
-        impl From<String> for $error_name {
-            fn from(s: String) -> Self {
-                $error_name(s.into(),
+        impl<S: Into<String>> From<S> for $error_name {
+            fn from(s: S) -> Self {
+                $error_name(s.into().into(),
                             (None, $crate::make_backtrace()))
             }
         }
@@ -490,15 +483,9 @@ macro_rules! error_chain {
             }
         ) *
 
-        impl<'a> From<&'a str> for $error_kind_name {
-            fn from(s: &'a str) -> Self {
-                $error_kind_name::Msg(s.to_string())
-            }
-        }
-
-        impl From<String> for $error_kind_name {
-            fn from(s: String) -> Self {
-                $error_kind_name::Msg(s)
+        impl<S: Into<String>> From<S> for $error_kind_name {
+            fn from(s: S) -> Self {
+                $error_kind_name::Msg(s.into())
             }
         }