From a8e7e791010a2ff1fca1b65dce48096419b99638 Mon Sep 17 00:00:00 2001
From: Ryan Mehri <ryan.mehri1@gmail.com>
Date: Mon, 16 Oct 2023 11:05:04 -0700
Subject: [PATCH] disable missing_copy_implementations lint on non_exhaustive
 types

use is_variant_list_non_exhaustive/is_field_list_non_exhaustive

remove unused tcx

inline non_exhaustive def/variant check
---
 compiler/rustc_lint/src/builtin.rs            |  5 ++++
 ...ing-copy-implementations-non-exhaustive.rs | 25 +++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 tests/ui/lint/missing-copy-implementations-non-exhaustive.rs

diff --git a/compiler/rustc_lint/src/builtin.rs b/compiler/rustc_lint/src/builtin.rs
index 536f78a73edb6..12e818b81cb39 100644
--- a/compiler/rustc_lint/src/builtin.rs
+++ b/compiler/rustc_lint/src/builtin.rs
@@ -677,6 +677,11 @@ impl<'tcx> LateLintPass<'tcx> for MissingCopyImplementations {
         if type_implements_negative_copy_modulo_regions(cx.tcx, ty, param_env) {
             return;
         }
+        if def.is_variant_list_non_exhaustive()
+            || def.variants().iter().any(|variant| variant.is_field_list_non_exhaustive())
+        {
+            return;
+        }
 
         // We shouldn't recommend implementing `Copy` on stateful things,
         // such as iterators.
diff --git a/tests/ui/lint/missing-copy-implementations-non-exhaustive.rs b/tests/ui/lint/missing-copy-implementations-non-exhaustive.rs
new file mode 100644
index 0000000000000..2d5e90720ef2a
--- /dev/null
+++ b/tests/ui/lint/missing-copy-implementations-non-exhaustive.rs
@@ -0,0 +1,25 @@
+// Test for issue #116766.
+// Ensure that we don't suggest impl'ing `Copy` for a type if it or at least one
+// of it's variants are marked as `non_exhaustive`.
+
+// check-pass
+
+#![deny(missing_copy_implementations)]
+
+#[non_exhaustive]
+pub enum MyEnum {
+    A,
+}
+
+#[non_exhaustive]
+pub struct MyStruct {
+    foo: usize,
+}
+
+pub enum MyEnum2 {
+    #[non_exhaustive]
+    A,
+    B,
+}
+
+fn main() {}