Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/ui/associated-consts/issue-69020-assoc-const-arith-overflow.rs b/tests/ui/associated-consts/issue-69020-assoc-const-arith-overflow.rs
new file mode 100644
index 000000000..d4af6e864
--- /dev/null
+++ b/tests/ui/associated-consts/issue-69020-assoc-const-arith-overflow.rs
@@ -0,0 +1,46 @@
+// revisions: noopt opt opt_with_overflow_checks
+//[noopt]compile-flags: -C opt-level=0
+//[opt]compile-flags: -O
+//[opt_with_overflow_checks]compile-flags: -C overflow-checks=on -O
+
+#![crate_type="lib"]
+
+pub trait Foo {
+    const NEG: i32;
+    const NEG_REV: i32;
+
+    const ADD: i32;
+    const ADD_REV: i32;
+
+    const DIV: i32;
+    const DIV_REV: i32;
+
+    const OOB: i32;
+    const OOB_REV: i32;
+}
+
+// These constants cannot be evaluated already (they depend on `T::N`), so they can just be linted
+// like normal run-time code. But codegen works a bit different in const context, so this test
+// makes sure that we still catch overflow. Also make sure we emit the same lints if we reverse the
+// operands (so that the generic operand comes first).
+impl<T: Foo> Foo for Vec<T> {
+    const NEG: i32 = -i32::MIN + T::NEG;
+    //~^ ERROR arithmetic operation will overflow
+    const NEG_REV: i32 = T::NEG + (-i32::MIN);
+    //~^ ERROR arithmetic operation will overflow
+
+    const ADD: i32 = (i32::MAX+1) + T::ADD;
+    //~^ ERROR arithmetic operation will overflow
+    const ADD_REV: i32 =  T::ADD + (i32::MAX+1);
+    //~^ ERROR arithmetic operation will overflow
+
+    const DIV: i32 = (1/0) + T::DIV;
+    //~^ ERROR operation will panic
+    const DIV_REV: i32 = T::DIV + (1/0);
+    //~^ ERROR operation will panic
+
+    const OOB: i32 = [1][1] + T::OOB;
+    //~^ ERROR operation will panic
+    const OOB_REV: i32 = T::OOB + [1][1];
+    //~^ ERROR operation will panic
+}