1 files changed, 82 insertions, 0 deletions
diff --git a/src/test/ui/structs-enums/multiple-reprs.rs b/src/test/ui/structs-enums/multiple-reprs.rs
new file mode 100644
index 000000000..4be503a0e
--- /dev/null
+++ b/src/test/ui/structs-enums/multiple-reprs.rs
@@ -0,0 +1,82 @@
+// run-pass
+
+#![allow(dead_code)]
+
+use std::mem::{size_of, align_of};
+use std::os::raw::c_int;
+
+// The two enums that follow are designed so that bugs trigger layout optimization.
+// Specifically, if either of the following reprs used here is not detected by the compiler,
+// then the sizes will be wrong.
+
+#[repr(C, u8)]
+enum E1 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+#[repr(u8, C)]
+enum E2 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+// Check that repr(int) and repr(C) are in fact different from the above
+
+#[repr(u8)]
+enum E3 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+#[repr(u16)]
+enum E4 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+#[repr(u32)]
+enum E5 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+#[repr(u64)]
+enum E6 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+#[repr(C)]
+enum E7 {
+    A(u8, u16, u8),
+    B(u8, u16, u8)
+}
+
+// From pr 37429
+
+#[repr(C,packed)]
+pub struct p0f_api_query {
+    pub magic: u32,
+    pub addr_type: u8,
+    pub addr: [u8; 16],
+}
+
+pub fn main() {
+    assert_eq!(size_of::<E1>(), 8);
+    assert_eq!(size_of::<E2>(), 8);
+    assert_eq!(size_of::<E3>(), 6);
+    assert_eq!(size_of::<E4>(), 8);
+    assert_eq!(size_of::<E5>(), align_size(10, align_of::<u32>()));
+    assert_eq!(size_of::<E6>(), align_size(14, align_of::<u64>()));
+    assert_eq!(size_of::<E7>(), align_size(6 + size_of::<c_int>(), align_of::<c_int>()));
+    assert_eq!(size_of::<p0f_api_query>(), 21);
+}
+
+fn align_size(size: usize, align: usize) -> usize {
+    if size % align != 0 {
+        size + (align - (size % align))
+    } else {
+        size
+    }
+}