Cleaner Debug representation of Error

src/error.rs

@@ -179,7 +179,6 @@ impl From<Error> for io::Error {
     }
 }
 
-#[derive(Debug)]
 struct ErrorImpl {
     code: ErrorCode,
     line: usize,
@@ -188,7 +187,6 @@ struct ErrorImpl {
 
 // Not public API. Should be pub(crate).
 #[doc(hidden)]
-#[derive(Debug)]
 pub enum ErrorCode {
     /// Catchall for syntax error messages
     Message(Box<str>),
@@ -382,7 +380,13 @@ impl Display for ErrorImpl {
 // end up seeing this representation because it is what unwrap() shows.
 impl Debug for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        Debug::fmt(&*self.err, f)
+        write!(
+            f,
+            "Error({:?}, line: {}, column: {})",
+            self.err.code.to_string(),
+            self.err.line,
+            self.err.column
+        )
     }
 }
 

tests/debug.rs

@@ -1,7 +1,7 @@
 #[macro_use]
 extern crate serde_json;
 
-use serde_json::Number;
+use serde_json::{Number, Value};
 
 #[test]
 fn number() {
@@ -45,3 +45,10 @@ fn value_array() {
 fn value_object() {
     assert_eq!(format!("{:?}", json!({})), "Object({})");
 }
+
+#[test]
+fn error() {
+    let err = serde_json::from_str::<Value>("{0}").unwrap_err();
+    let expected = "Error(\"key must be a string\", line: 1, column: 2)";
+    assert_eq!(format!("{:?}", err), expected);
+}