Includes TODO comment for hypot lint

Author: thiagoarrais

tests/ui/floating_point_hypot.fixed

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::suboptimal_flops, clippy::imprecise_flops)]
+#![warn(clippy::imprecise_flops)]
 
 fn main() {
     let x = 3f32;
@@ -8,6 +8,7 @@ fn main() {
     let _ = (x + 1f32).hypot(y);
     let _ = x.hypot(y);
     // Cases where the lint shouldn't be applied
+    // TODO: linting this adds some complexity, but could be done
     let _ = x.mul_add(x, y * y).sqrt();
-    let _ = x.mul_add(4f32, y * y).sqrt();
+    let _ = (x * 4f32 + y * y).sqrt();
 }

tests/ui/floating_point_hypot.rs

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::suboptimal_flops, clippy::imprecise_flops)]
+#![warn(clippy::imprecise_flops)]
 
 fn main() {
     let x = 3f32;
@@ -8,6 +8,7 @@ fn main() {
     let _ = ((x + 1f32) * (x + 1f32) + y * y).sqrt();
     let _ = (x.powi(2) + y.powi(2)).sqrt();
     // Cases where the lint shouldn't be applied
+    // TODO: linting this adds some complexity, but could be done
     let _ = x.mul_add(x, y * y).sqrt();
     let _ = (x * 4f32 + y * y).sqrt();
 }

tests/ui/floating_point_hypot.stderr

@@ -18,13 +18,5 @@ error: hypotenuse can be computed more accurately
 LL |     let _ = (x.powi(2) + y.powi(2)).sqrt();
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using: `x.hypot(y)`
 
-error: multiply and add expressions can be calculated more efficiently and accurately
-  --> $DIR/floating_point_hypot.rs:12:13
-   |
-LL |     let _ = (x * 4f32 + y * y).sqrt();
-   |             ^^^^^^^^^^^^^^^^^^ help: consider using: `x.mul_add(4f32, y * y)`
-   |
-   = note: `-D clippy::suboptimal-flops` implied by `-D warnings`
-
-error: aborting due to 4 previous errors
+error: aborting due to 3 previous errors