1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/feature-gates/feature-gate-negate-unsigned.rs b/src/test/ui/feature-gates/feature-gate-negate-unsigned.rs
new file mode 100644
index 000000000..05e04f3e2
--- /dev/null
+++ b/src/test/ui/feature-gates/feature-gate-negate-unsigned.rs
@@ -0,0 +1,18 @@
+// Test that negating unsigned integers doesn't compile
+
+struct S;
+impl std::ops::Neg for S {
+    type Output = u32;
+    fn neg(self) -> u32 { 0 }
+}
+
+fn main() {
+    let _max: usize = -1;
+    //~^ ERROR cannot apply unary operator `-` to type `usize`
+
+    let x = 5u8;
+    let _y = -x;
+    //~^ ERROR cannot apply unary operator `-` to type `u8`
+
+    -S; // should not trigger the gate; issue 26840
+}