some more tests for i128 oveflow behavior

Author: RalfJung

src/test/ui/consts/const-err2.rs

@@ -17,16 +17,22 @@ fn black_box<T>(_: T) {
 fn main() {
     let a = -std::i8::MIN;
     //~^ ERROR const_err
+    let a_i128 = -std::i128::MIN;
+    //~^ ERROR const_err
     let b = 200u8 + 200u8 + 200u8;
     //~^ ERROR const_err
+    let b_i128 = std::i128::MIN - std::i128::MAX;
+    //~^ ERROR const_err
     let c = 200u8 * 4;
     //~^ ERROR const_err
     let d = 42u8 - (42u8 + 1);
     //~^ ERROR const_err
     let _e = [5u8][1];
-    //~^ ERROR index out of bounds
+    //~^ ERROR const_err
     black_box(a);
+    black_box(a_i128);
     black_box(b);
+    black_box(b_i128);
     black_box(c);
     black_box(d);
 }

src/test/ui/consts/const-err2.stderr

@@ -11,28 +11,40 @@ LL | #![deny(const_err)]
    |         ^^^^^^^^^
 
 error: this expression will panic at runtime
-  --> $DIR/const-err2.rs:20:13
+  --> $DIR/const-err2.rs:20:18
+   |
+LL |     let a_i128 = -std::i128::MIN;
+   |                  ^^^^^^^^^^^^^^^ attempt to negate with overflow
+
+error: this expression will panic at runtime
+  --> $DIR/const-err2.rs:22:13
    |
 LL |     let b = 200u8 + 200u8 + 200u8;
    |             ^^^^^^^^^^^^^ attempt to add with overflow
 
 error: this expression will panic at runtime
-  --> $DIR/const-err2.rs:22:13
+  --> $DIR/const-err2.rs:24:18
+   |
+LL |     let b_i128 = std::i128::MIN - std::i128::MAX;
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ attempt to subtract with overflow
+
+error: this expression will panic at runtime
+  --> $DIR/const-err2.rs:26:13
    |
 LL |     let c = 200u8 * 4;
    |             ^^^^^^^^^ attempt to multiply with overflow
 
 error: this expression will panic at runtime
-  --> $DIR/const-err2.rs:24:13
+  --> $DIR/const-err2.rs:28:13
    |
 LL |     let d = 42u8 - (42u8 + 1);
    |             ^^^^^^^^^^^^^^^^^ attempt to subtract with overflow
 
 error: index out of bounds: the len is 1 but the index is 1
-  --> $DIR/const-err2.rs:26:14
+  --> $DIR/const-err2.rs:30:14
    |
 LL |     let _e = [5u8][1];
    |              ^^^^^^^^
 
-error: aborting due to 5 previous errors
+error: aborting due to 7 previous errors
 

src/test/ui/consts/const-err3.rs

@@ -17,16 +17,22 @@ fn black_box<T>(_: T) {
 fn main() {
     let a = -std::i8::MIN;
     //~^ ERROR const_err
+    let a_i128 = -std::i128::MIN;
+    //~^ ERROR const_err
     let b = 200u8 + 200u8 + 200u8;
     //~^ ERROR const_err
+    let b_i128 = std::i128::MIN - std::i128::MAX;
+    //~^ ERROR const_err
     let c = 200u8 * 4;
     //~^ ERROR const_err
     let d = 42u8 - (42u8 + 1);
     //~^ ERROR const_err
     let _e = [5u8][1];
     //~^ ERROR const_err
     black_box(a);
+    black_box(a_i128);
     black_box(b);
+    black_box(b_i128);
     black_box(c);
     black_box(d);
 }

src/test/ui/consts/const-err3.stderr

@@ -10,29 +10,41 @@ note: the lint level is defined here
 LL | #![deny(const_err)]
    |         ^^^^^^^^^
 
+error: attempt to negate with overflow
+  --> $DIR/const-err3.rs:20:18
+   |
+LL |     let a_i128 = -std::i128::MIN;
+   |                  ^^^^^^^^^^^^^^^
+
 error: attempt to add with overflow
-  --> $DIR/const-err3.rs:20:13
+  --> $DIR/const-err3.rs:22:13
    |
 LL |     let b = 200u8 + 200u8 + 200u8;
    |             ^^^^^^^^^^^^^
 
+error: attempt to subtract with overflow
+  --> $DIR/const-err3.rs:24:18
+   |
+LL |     let b_i128 = std::i128::MIN - std::i128::MAX;
+   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
 error: attempt to multiply with overflow
-  --> $DIR/const-err3.rs:22:13
+  --> $DIR/const-err3.rs:26:13
    |
 LL |     let c = 200u8 * 4;
    |             ^^^^^^^^^
 
 error: attempt to subtract with overflow
-  --> $DIR/const-err3.rs:24:13
+  --> $DIR/const-err3.rs:28:13
    |
 LL |     let d = 42u8 - (42u8 + 1);
    |             ^^^^^^^^^^^^^^^^^
 
 error: index out of bounds: the len is 1 but the index is 1
-  --> $DIR/const-err3.rs:26:14
+  --> $DIR/const-err3.rs:30:14
    |
 LL |     let _e = [5u8][1];
    |              ^^^^^^^^
 
-error: aborting due to 5 previous errors
+error: aborting due to 7 previous errors
 

src/test/ui/consts/const-int-arithmetic.rs

@@ -7,7 +7,7 @@
 #![feature(const_saturating_int_methods)]
 #![feature(const_wrapping_int_methods)]
 
-use std::i8;
+use std::{i8, i128};
 
 macro_rules! suite {
     ($(
@@ -65,6 +65,10 @@ suite!(
         C26: 5i8.checked_rem_euclid(0), None;
         C27: i8::MIN.checked_rem_euclid(-1), None;
     }
+    checked_i128 -> Option<i128> {
+        CHK_ADD_I128: i128::MAX.checked_add(1), None;
+        CHK_MUL_I128: i128::MIN.checked_mul(-1), None;
+    }
 
     saturating_and_wrapping -> i8 {
         // `const_saturating_int_methods`
@@ -104,6 +108,13 @@ suite!(
         C47: 100i8.wrapping_rem_euclid(10), 0;
         C48: (-128i8).wrapping_rem_euclid(-1), 0;
     }
+    saturating_and_wrapping_i128 -> i128 {
+        SAT_ADD_I128: i128::MAX.saturating_add(1), i128::MAX;
+        SAT_MUL_I128: i128::MAX.saturating_mul(2), i128::MAX;
+
+        WRP_ADD_I128: i128::MAX.wrapping_add(1), i128::MIN;
+        WRP_MUL_I128: i128::MAX.wrapping_mul(3), i128::MAX-2;
+    }
 
     overflowing -> (i8, bool) {
         // `const_overflowing_int_methods`
@@ -119,12 +130,18 @@ suite!(
 
         C55: 5i8.overflowing_rem_euclid(2), (1, false);
         C56: i8::MIN.overflowing_rem_euclid(-1), (0, true);
-
+    }
+    overflowing_i128 -> (i128, bool) {
+        OFL_ADD_I128: i128::MAX.overflowing_add(1), (i128::MIN, true);
+        OFL_MUL_I128: i128::MAX.overflowing_mul(3), (i128::MAX-2, true);
     }
 );
 
 fn main() {
    checked();
+   checked_i128();
    saturating_and_wrapping();
+   saturating_and_wrapping_i128();
    overflowing();
+   overflowing_i128();
 }