1 files changed, 61 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/absurd-extreme-comparisons.rs b/src/tools/clippy/tests/ui/absurd-extreme-comparisons.rs
new file mode 100644
index 00000000000..d205b383d1f
--- /dev/null
+++ b/src/tools/clippy/tests/ui/absurd-extreme-comparisons.rs
@@ -0,0 +1,61 @@
+#![warn(clippy::absurd_extreme_comparisons)]
+#![allow(
+    unused,
+    clippy::eq_op,
+    clippy::no_effect,
+    clippy::unnecessary_operation,
+    clippy::needless_pass_by_value
+)]
+
+#[rustfmt::skip]
+fn main() {
+    const Z: u32 = 0;
+    let u: u32 = 42;
+    u <= 0;
+    u <= Z;
+    u < Z;
+    Z >= u;
+    Z > u;
+    u > u32::MAX;
+    u >= u32::MAX;
+    u32::MAX < u;
+    u32::MAX <= u;
+    1-1 > u;
+    u >= !0;
+    u <= 12 - 2*6;
+    let i: i8 = 0;
+    i < -127 - 1;
+    i8::MAX >= i;
+    3-7 < i32::MIN;
+    let b = false;
+    b >= true;
+    false > b;
+    u > 0; // ok
+    // this is handled by clippy::unit_cmp
+    () < {};
+}
+
+use std::cmp::{Ordering, PartialEq, PartialOrd};
+
+#[derive(PartialEq, PartialOrd)]
+pub struct U(u64);
+
+impl PartialEq<u32> for U {
+    fn eq(&self, other: &u32) -> bool {
+        self.eq(&U(u64::from(*other)))
+    }
+}
+impl PartialOrd<u32> for U {
+    fn partial_cmp(&self, other: &u32) -> Option<Ordering> {
+        self.partial_cmp(&U(u64::from(*other)))
+    }
+}
+
+pub fn foo(val: U) -> bool {
+    val > u32::MAX
+}
+
+pub fn bar(len: u64) -> bool {
+    // This is OK as we are casting from target sized to fixed size
+    len >= usize::MAX as u64
+}