Test cases for checking arithmetic overflow during const eval.

src/test/compile-fail/const-eval-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.
+
+// Evaluation of constants in refutable patterns goes through
+// different compiler control-flow paths.
+
+#![allow(unused_imports)]
+
+use std::fmt;
+use std::{i8, i16, i32, i64, isize};
+use std::{u8, u16, u32, u64, usize};
+
+const NEG_128: i8 = -128;
+const NEG_NEG_128: i8 = -NEG_128;
+//~^ ERROR constant evaluation error: attempted to negate with overflow
+//~| ERROR attempted to negate with overflow
+
+fn main() {
+    match -128i8 {
+        NEG_NEG_128 => println!("A"),
+        _ => println!("B"),
+    }
+}

src/test/compile-fail/const-eval-overflow-3.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.
+
+// Evaluation of constants in array-elem count goes through different
+// compiler control-flow paths.
+//
+// This test is checking the count in an array expression.
+
+#![allow(unused_imports)]
+
+use std::fmt;
+use std::{i8, i16, i32, i64, isize};
+use std::{u8, u16, u32, u64, usize};
+
+const A_I8_I
+    : [u32; (i8::MAX as usize) + 1]
+    = [0; (i8::MAX + 1) as usize];
+//~^ ERROR error evaluating count: attempted to add with overflow
+
+fn main() {
+    foo(&A_I8_I[..]);
+}
+
+fn foo<T:fmt::Debug>(x: T) {
+    println!("{:?}", x);
+}
+

src/test/compile-fail/const-eval-overflow-3b.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.
+
+// Evaluation of constants in array-elem count goes through different
+// compiler control-flow paths.
+//
+// This test is checking the count in an array expression.
+//
+// This is a variation of another such test, but in this case the
+// types for the left- and right-hand sides of the addition do not
+// match (as well as overflow).
+
+#![allow(unused_imports)]
+
+use std::fmt;
+use std::{i8, i16, i32, i64, isize};
+use std::{u8, u16, u32, u64, usize};
+
+const A_I8_I
+    : [u32; (i8::MAX as usize) + 1]
+    = [0; (i8::MAX + 1u8) as usize];
+//~^ ERROR mismatched types
+
+fn main() {
+    foo(&A_I8_I[..]);
+}
+
+fn foo<T:fmt::Debug>(x: T) {
+    println!("{:?}", x);
+}
+

src/test/compile-fail/const-eval-overflow-4.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-test this should fail to compile (#23833)
+
+// Evaluation of constants in array-elem count goes through different
+// compiler control-flow paths.
+//
+// This test is checking the count in an array type.
+
+#![allow(unused_imports)]
+
+use std::fmt;
+use std::{i8, i16, i32, i64, isize};
+use std::{u8, u16, u32, u64, usize};
+
+const A_I8_T
+    : [u32; (i8::MAX as i8 + 1i8) as usize]
+    //~^ ERROR error evaluating count: attempted to add with overflow
+    = [0; (i8::MAX as usize) + 1];
+
+fn main() {
+    foo(&A_I8_T[..]);
+}
+
+fn foo<T:fmt::Debug>(x: T) {
+    println!("{:?}", x);
+}
+

src/test/compile-fail/const-eval-overflow-4b.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.
+
+// Evaluation of constants in array-elem count goes through different
+// compiler control-flow paths.
+//
+// This test is checking the count in an array type.
+
+#![allow(unused_imports)]
+
+use std::fmt;
+use std::{i8, i16, i32, i64, isize};
+use std::{u8, u16, u32, u64, usize};
+
+const A_I8_T
+    : [u32; (i8::MAX as i8 + 1u8) as usize]
+    //~^ ERROR mismatched types
+    = [0; (i8::MAX as usize) + 1];
+
+fn main() {
+    foo(&A_I8_T[..]);
+}
+
+fn foo<T:fmt::Debug>(x: T) {
+    println!("{:?}", x);
+}
+

src/test/compile-fail/const-eval-overflow.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.
+
+#![allow(unused_imports)]
+
+// Note: the relevant lint pass here runs before some of the constant
+// evaluation below (e.g. that performed by trans and llvm), so if you
+// change this warn to a deny, then the compiler will exit before
+// those errors are detected.
+#![warn(unsigned_negation)]
+
+use std::fmt;
+use std::{i8, i16, i32, i64, isize};
+use std::{u8, u16, u32, u64, usize};
+
+const VALS_I8: (i8, i8, i8, i8) =
+    (-i8::MIN,
+     //~^ ERROR attempted to negate with overflow
+     i8::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     i8::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     i8::MIN * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_I16: (i16, i16, i16, i16) =
+    (-i16::MIN,
+     //~^ ERROR attempted to negate with overflow
+     i16::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     i16::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     i16::MIN * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_I32: (i32, i32, i32, i32) =
+    (-i32::MIN,
+     //~^ ERROR attempted to negate with overflow
+     i32::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     i32::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     i32::MIN * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_I64: (i64, i64, i64, i64) =
+    (-i64::MIN,
+     //~^ ERROR attempted to negate with overflow
+     i64::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     i64::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     i64::MAX * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_U8: (u8, u8, u8, u8) =
+    (-u8::MIN,
+     //~^ WARNING negation of unsigned int variable may be unintentional
+     // (The above is separately linted; unsigned negation is defined to be !x+1.)
+     u8::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     u8::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     u8::MAX * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_U16: (u16, u16, u16, u16) =
+    (-u16::MIN,
+     //~^ WARNING negation of unsigned int variable may be unintentional
+     // (The above is separately linted; unsigned negation is defined to be !x+1.)
+     u16::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     u16::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     u16::MAX * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_U32: (u32, u32, u32, u32) =
+    (-u32::MIN,
+     //~^ WARNING negation of unsigned int variable may be unintentional
+     // (The above is separately linted; unsigned negation is defined to be !x+1.)
+     u32::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     u32::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     u32::MAX * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+const VALS_U64: (u64, u64, u64, u64) =
+    (-u64::MIN,
+     //~^ WARNING negation of unsigned int variable may be unintentional
+     // (The above is separately linted; unsigned negation is defined to be !x+1.)
+     u64::MIN - 1,
+     //~^ ERROR attempted to sub with overflow
+     u64::MAX + 1,
+     //~^ ERROR attempted to add with overflow
+     u64::MAX * 2,
+     //~^ ERROR attempted to mul with overflow
+     );
+
+fn main() {
+    foo(VALS_I8);
+    foo(VALS_I16);
+    foo(VALS_I32);
+    foo(VALS_I64);
+
+    foo(VALS_U8);
+    foo(VALS_U16);
+    foo(VALS_U32);
+    foo(VALS_U64);
+}
+
+fn foo<T:fmt::Debug>(x: T) {
+    println!("{:?}", x);
+}