From 2d0d73ea5a004158e07ec6169b517c7ca6cbe3b0 Mon Sep 17 00:00:00 2001
From: varkor <github@varkor.com>
Date: Tue, 1 May 2018 20:25:30 +0100
Subject: [PATCH] Add a print_types_sizes regression test

---
 src/test/ui/print_type_sizes/repr_int_c.rs    | 35 +++++++++++++++++++
 .../ui/print_type_sizes/repr_int_c.stdout     | 12 +++++++
 2 files changed, 47 insertions(+)
 create mode 100644 src/test/ui/print_type_sizes/repr_int_c.rs
 create mode 100644 src/test/ui/print_type_sizes/repr_int_c.stdout

diff --git a/src/test/ui/print_type_sizes/repr_int_c.rs b/src/test/ui/print_type_sizes/repr_int_c.rs
new file mode 100644
index 0000000000000..04bb2ab26f3d1
--- /dev/null
+++ b/src/test/ui/print_type_sizes/repr_int_c.rs
@@ -0,0 +1,35 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -Z print-type-sizes
+// compile-pass
+
+// This test makes sure that the tag is not grown for `repr(C)` or `repr(u8)`
+// variants (see https://github.com/rust-lang/rust/issues/50098 for the original bug).
+
+#![feature(start)]
+#![allow(dead_code)]
+
+#[repr(C, u8)]
+enum ReprCu8 {
+    A(u16),
+    B,
+}
+
+#[repr(u8)]
+enum Repru8 {
+    A(u16),
+    B,
+}
+
+#[start]
+fn start(_: isize, _: *const *const u8) -> isize {
+    0
+}
diff --git a/src/test/ui/print_type_sizes/repr_int_c.stdout b/src/test/ui/print_type_sizes/repr_int_c.stdout
new file mode 100644
index 0000000000000..254b3c7a8531e
--- /dev/null
+++ b/src/test/ui/print_type_sizes/repr_int_c.stdout
@@ -0,0 +1,12 @@
+print-type-size type: `ReprCu8`: 4 bytes, alignment: 2 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `A`: 3 bytes
+print-type-size         padding: 1 bytes
+print-type-size         field `.0`: 2 bytes, alignment: 2 bytes
+print-type-size     variant `B`: 1 bytes
+print-type-size type: `Repru8`: 4 bytes, alignment: 2 bytes
+print-type-size     discriminant: 1 bytes
+print-type-size     variant `A`: 3 bytes
+print-type-size         padding: 1 bytes
+print-type-size         field `.0`: 2 bytes, alignment: 2 bytes
+print-type-size     variant `B`: 0 bytes