1 files changed, 51 insertions, 0 deletions
diff --git a/tests/ui/lint/invalid-nan-comparison.rs b/tests/ui/lint/invalid-nan-comparison.rs
new file mode 100644
index 000000000..d7e793ca5
--- /dev/null
+++ b/tests/ui/lint/invalid-nan-comparison.rs
@@ -0,0 +1,51 @@
+// check-pass
+
+fn main() {
+    f32();
+    f64();
+}
+
+const TEST: bool = 5f32 == f32::NAN;
+//~^ WARN incorrect NaN comparison
+
+fn f32() {
+    macro_rules! number { () => { 5f32 }; }
+    let x = number!();
+    x == f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    x != f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    x < f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    x > f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    x <= f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    x >= f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    number!() == f32::NAN;
+    //~^ WARN incorrect NaN comparison
+    f32::NAN != number!();
+    //~^ WARN incorrect NaN comparison
+}
+
+fn f64() {
+    macro_rules! number { () => { 5f64 }; }
+    let x = number!();
+    x == f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    x != f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    x < f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    x > f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    x <= f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    x >= f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    number!() == f64::NAN;
+    //~^ WARN incorrect NaN comparison
+    f64::NAN != number!();
+    //~^ WARN incorrect NaN comparison
+}