1 files changed, 111 insertions, 0 deletions
diff --git a/tests/ui/structs-enums/enum-discrim-manual-sizing.rs b/tests/ui/structs-enums/enum-discrim-manual-sizing.rs
new file mode 100644
index 00000000000..c8b362c9917
--- /dev/null
+++ b/tests/ui/structs-enums/enum-discrim-manual-sizing.rs
@@ -0,0 +1,111 @@
+// run-pass
+#![allow(dead_code)]
+
+use std::mem::{size_of, align_of};
+
+#[repr(i8)]
+enum Ei8 {
+    Ai8 = 0,
+    Bi8 = 1
+}
+
+#[repr(u8)]
+enum Eu8 {
+    Au8 = 0,
+    Bu8 = 1
+}
+
+#[repr(i16)]
+enum Ei16 {
+    Ai16 = 0,
+    Bi16 = 1
+}
+
+#[repr(u16)]
+enum Eu16 {
+    Au16 = 0,
+    Bu16 = 1
+}
+
+#[repr(i32)]
+enum Ei32 {
+    Ai32 = 0,
+    Bi32 = 1
+}
+
+#[repr(u32)]
+enum Eu32 {
+    Au32 = 0,
+    Bu32 = 1
+}
+
+#[repr(i64)]
+enum Ei64 {
+    Ai64 = 0,
+    Bi64 = 1
+}
+
+#[repr(u64)]
+enum Eu64 {
+    Au64 = 0,
+    Bu64 = 1
+}
+
+#[repr(isize)]
+enum Eint {
+    Aint = 0,
+    Bint = 1
+}
+
+#[repr(usize)]
+enum Euint {
+    Auint = 0,
+    Buint = 1
+}
+
+#[repr(u8)]
+enum Eu8NonCLike<T> {
+    _None,
+    _Some(T),
+}
+
+#[repr(i64)]
+enum Ei64NonCLike<T> {
+    _None,
+    _Some(T),
+}
+
+#[repr(u64)]
+enum Eu64NonCLike<T> {
+    _None,
+    _Some(T),
+}
+
+pub fn main() {
+    assert_eq!(size_of::<Ei8>(), 1);
+    assert_eq!(size_of::<Eu8>(), 1);
+    assert_eq!(size_of::<Ei16>(), 2);
+    assert_eq!(size_of::<Eu16>(), 2);
+    assert_eq!(size_of::<Ei32>(), 4);
+    assert_eq!(size_of::<Eu32>(), 4);
+    assert_eq!(size_of::<Ei64>(), 8);
+    assert_eq!(size_of::<Eu64>(), 8);
+    assert_eq!(size_of::<Eint>(), size_of::<isize>());
+    assert_eq!(size_of::<Euint>(), size_of::<usize>());
+    assert_eq!(size_of::<Eu8NonCLike<()>>(), 1);
+    assert_eq!(size_of::<Ei64NonCLike<()>>(), 8);
+    assert_eq!(size_of::<Eu64NonCLike<()>>(), 8);
+    let u8_expected_size = round_up(9, align_of::<Eu64NonCLike<u8>>());
+    assert_eq!(size_of::<Eu64NonCLike<u8>>(), u8_expected_size);
+    let array_expected_size = round_up(28, align_of::<Eu64NonCLike<[u32; 5]>>());
+    assert_eq!(size_of::<Eu64NonCLike<[u32; 5]>>(), array_expected_size);
+    assert_eq!(size_of::<Eu64NonCLike<[u32; 6]>>(), 32);
+
+    assert_eq!(align_of::<Eu32>(), align_of::<u32>());
+    assert_eq!(align_of::<Eu64NonCLike<u8>>(), align_of::<u64>());
+}
+
+// Rounds x up to the next multiple of a
+fn round_up(x: usize, a: usize) -> usize {
+    ((x + (a - 1)) / a) * a
+}