Implement std::error::Error for GDError

src/errors.rs

@@ -1,5 +1,7 @@
 
 //! The library's possible errors.
+use std::fmt;
+use std::{fmt::Formatter, error::Error};
 
 /// Result of Type and GDError.
 pub type GDResult<T> = Result<T, GDError>;
@@ -38,3 +40,11 @@ pub enum GDError {
     /// Couldn't parse a value.
     TypeParse,
 }
+
+impl Error for GDError {}
+
+impl fmt::Display for GDError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}