Support f16 and f128 in cast_nan_to_int lint

Author: samueltardieu

clippy_lints/src/casts/cast_nan_to_int.rs

@@ -21,9 +21,10 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &Expr<'_>, cast_expr: &Expr<'_>,
 
 fn is_known_nan(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
     match ConstEvalCtxt::new(cx).eval(e) {
-        // FIXME(f16_f128): add these types when nan checks are available on all platforms
+        Some(Constant::F128(n)) => n.is_nan(),
         Some(Constant::F64(n)) => n.is_nan(),
         Some(Constant::F32(n)) => n.is_nan(),
+        Some(Constant::F16(n)) => n.is_nan(),
         _ => false,
     }
 }

tests/ui/cast_nan_to_int.rs

@@ -1,5 +1,5 @@
-// FIXME(f16_f128): add tests when constants are available
-
+#![feature(f128)]
+#![feature(f16)]
 #![warn(clippy::cast_nan_to_int)]
 #![allow(clippy::eq_op)]
 
@@ -22,6 +22,12 @@ fn main() {
     let _ = (f32::INFINITY / f32::NEG_INFINITY) as usize;
     //~^ cast_nan_to_int
 
+    let _ = f16::NAN as usize;
+    //~^ cast_nan_to_int
+
+    let _ = f128::NAN as u128;
+    //~^ cast_nan_to_int
+
     // those won't be linted:
     let _ = (1.0_f32 / 0.0) as usize;
     let _ = (f32::INFINITY * f32::NEG_INFINITY) as usize;

tests/ui/cast_nan_to_int.stderr

@@ -48,5 +48,21 @@ LL |     let _ = (f32::INFINITY / f32::NEG_INFINITY) as usize;
    |
    = note: this always evaluates to 0
 
-error: aborting due to 6 previous errors
+error: casting a known NaN to usize
+  --> tests/ui/cast_nan_to_int.rs:25:13
+   |
+LL |     let _ = f16::NAN as usize;
+   |             ^^^^^^^^^^^^^^^^^
+   |
+   = note: this always evaluates to 0
+
+error: casting a known NaN to u128
+  --> tests/ui/cast_nan_to_int.rs:28:13
+   |
+LL |     let _ = f128::NAN as u128;
+   |             ^^^^^^^^^^^^^^^^^
+   |
+   = note: this always evaluates to 0
+
+error: aborting due to 8 previous errors