break!: stop abusing Display for Error codes

Display impls should return human-readable strings. After
this commit we're able to introduce a proper Display impl
in the future without that being a breaking change.

1 files changed, 4 insertions, 5 deletions

diff --git a/src/error.rs b/src/error.rs
index 390b060..4ff9dfd 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -23,12 +23,11 @@ macro_rules! impl_error {
             }
         }
 
-        impl std::fmt::Display for Error {
-            /// Convert an enum variant back into the `kebap-case` error code as typically written
-            /// in the WHATWG spec.
-            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        impl Error {
+            /// Returns the `kebap-case` error code as defined in the WHATWG spec.
+            pub fn code(&self) -> &'static str {
                 match *self {
-                    $( Self::$variant => $string.fmt(f), )*
+                    $( Self::$variant => $string, )*
                 }
             }
         }