1 files changed, 110 insertions, 0 deletions
diff --git a/src/test/ui/discrim-overflow-2.rs b/src/test/ui/discrim-overflow-2.rs
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+++ b/src/test/ui/discrim-overflow-2.rs
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+// Copyright 2015 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.
+
+// ignore-tidy-linelength
+
+// Issue 23030: Detect overflowing discriminant
+//
+// Check that we detect the overflow even if enum is not used.
+
+// See also run-pass/discrim-explicit-23030.rs where the suggested
+// workaround is tested.
+
+use std::{i8,u8,i16,u16,i32,u32,i64, u64};
+
+fn f_i8() {
+    #[repr(i8)]
+    enum A {
+        Ok = i8::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 127i8
+              //~| NOTE explicitly set `OhNo = -128i8` if that is desired outcome
+    }
+}
+
+fn f_u8() {
+    #[repr(u8)]
+    enum A {
+        Ok = u8::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 255u8
+              //~| NOTE explicitly set `OhNo = 0u8` if that is desired outcome
+    }
+}
+
+fn f_i16() {
+    #[repr(i16)]
+    enum A {
+        Ok = i16::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 32767i16
+              //~| NOTE explicitly set `OhNo = -32768i16` if that is desired outcome
+    }
+}
+
+fn f_u16() {
+    #[repr(u16)]
+    enum A {
+        Ok = u16::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 65535u16
+              //~| NOTE explicitly set `OhNo = 0u16` if that is desired outcome
+    }
+}
+
+fn f_i32() {
+    #[repr(i32)]
+    enum A {
+        Ok = i32::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 2147483647i32
+              //~| NOTE explicitly set `OhNo = -2147483648i32` if that is desired outcome
+    }
+}
+
+fn f_u32() {
+    #[repr(u32)]
+    enum A {
+        Ok = u32::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 4294967295u32
+              //~| NOTE explicitly set `OhNo = 0u32` if that is desired outcome
+    }
+}
+
+fn f_i64() {
+    #[repr(i64)]
+    enum A {
+        Ok = i64::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 9223372036854775807i64
+              //~| NOTE explicitly set `OhNo = -9223372036854775808i64` if that is desired outcome
+    }
+}
+
+fn f_u64() {
+    #[repr(u64)]
+    enum A {
+        Ok = u64::MAX - 1,
+        Ok2,
+        OhNo, //~ ERROR enum discriminant overflowed [E0370]
+              //~| NOTE overflowed on value after 18446744073709551615u64
+              //~| NOTE explicitly set `OhNo = 0u64` if that is desired outcome
+    }
+}
+
+fn main() { }