codegen: Don't automatically derive Debug and Copy for non-rust enums.

Fixes rust-lang#2143

Author: emilio

src/codegen/mod.rs

@@ -3005,14 +3005,9 @@ impl CodeGenerator for Enum {
 
         if !variation.is_const() {
             let mut derives = derives_of_item(item, ctx);
-            // For backwards compat, enums always derive Debug/Clone/Eq/PartialEq/Hash, even
-            // if we don't generate those by default.
-            if !item.annotations().disallow_debug() {
-                derives.insert(DerivableTraits::DEBUG);
-            }
-            if !item.annotations().disallow_copy() {
-                derives.insert(DerivableTraits::COPY);
-            }
+            // For backwards compat, enums always derive
+            // Clone/Eq/PartialEq/Hash, even if we don't generate those by
+            // default.
             derives.insert(
                 DerivableTraits::CLONE |
                     DerivableTraits::HASH |

tests/expectations/tests/enum-no-debug-rust.rs

@@ -13,7 +13,7 @@ pub struct foo {
 pub const foo_FOO_A: foo__bindgen_ty_1 = foo__bindgen_ty_1::FOO_A;
 pub const foo_FOO_B: foo__bindgen_ty_1 = foo__bindgen_ty_1::FOO_B;
 #[repr(u32)]
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+#[derive(Copy, Clone, Hash, PartialEq, Eq)]
 pub enum foo__bindgen_ty_1 {
     FOO_A = 0,
     FOO_B = 1,
@@ -51,7 +51,7 @@ impl Default for foo {
     }
 }
 #[repr(u32)]
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+#[derive(Copy, Clone, Hash, PartialEq, Eq)]
 pub enum Foo {
     Bar = 0,
     Qux = 1,
@@ -70,8 +70,8 @@ pub enum NoDebug {
 }
 #[repr(u32)]
 /// <div rustbindgen derive="Debug"></div>
-#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+#[derive(Copy, Clone, Hash, PartialEq, Eq, Debug)]
 pub enum Debug {
     Debug1 = 0,
     Debug2 = 1,
-}
+}