Rename Error::Custom to Error::CustomMessage

src/error/display.rs

@@ -84,7 +84,7 @@ impl fmt::Display for Error {
             ModulationError { dividend, divisor } => {
                 write!(f, "Error modulating {} % {}", dividend, divisor)
             },
-            Custom(message) => write!(f, "Error: {}", message),
+            CustomMessage(message) => write!(f, "Error: {}", message),
         }
     }
 }

src/error/mod.rs

@@ -155,7 +155,7 @@ pub enum Error {
     },
 
     /// A custom error explained by its message.
-    Custom(String),
+    CustomMessage(String),
 }
 
 impl Error {