internal: refactor incorrect case diagnostics

crates/hir/src/diagnostics.rs

@@ -34,6 +34,7 @@ macro_rules! diagnostics {
 diagnostics![
     BreakOutsideOfLoop,
     InactiveCode,
+    IncorrectCase,
     MacroError,
     MismatchedArgCount,
     MissingFields,
@@ -195,31 +196,3 @@ impl Diagnostic for InternalBailedOut {
 }
 
 pub use hir_ty::diagnostics::IncorrectCase;
-
-impl Diagnostic for IncorrectCase {
-    fn code(&self) -> DiagnosticCode {
-        DiagnosticCode("incorrect-ident-case")
-    }
-
-    fn message(&self) -> String {
-        format!(
-            "{} `{}` should have {} name, e.g. `{}`",
-            self.ident_type,
-            self.ident_text,
-            self.expected_case.to_string(),
-            self.suggested_text
-        )
-    }
-
-    fn display_source(&self) -> InFile<SyntaxNodePtr> {
-        InFile::new(self.file, self.ident.clone().into())
-    }
-
-    fn as_any(&self) -> &(dyn Any + Send + 'static) {
-        self
-    }
-
-    fn is_experimental(&self) -> bool {
-        true
-    }
-}