Refactor floating! macro and nofloat panic message

Author: zlfn

library/core/src/fmt/float.rs

@@ -196,39 +196,40 @@ where
 }
 
 macro_rules! floating {
-    ($ty:ident) => {
-        #[stable(feature = "rust1", since = "1.0.0")]
-        impl Debug for $ty {
-            fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
-                float_to_general_debug(fmt, self)
+    ($($ty:ident)*) => (
+        $(
+            #[stable(feature = "rust1", since = "1.0.0")]
+            impl Debug for $ty {
+                fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
+                    float_to_general_debug(fmt, self)
+                }
             }
-        }
 
-        #[stable(feature = "rust1", since = "1.0.0")]
-        impl Display for $ty {
-            fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
-                float_to_decimal_display(fmt, self)
+            #[stable(feature = "rust1", since = "1.0.0")]
+            impl Display for $ty {
+                fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
+                    float_to_decimal_display(fmt, self)
+                }
             }
-        }
 
-        #[stable(feature = "rust1", since = "1.0.0")]
-        impl LowerExp for $ty {
-            fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
-                float_to_exponential_common(fmt, self, false)
+            #[stable(feature = "rust1", since = "1.0.0")]
+            impl LowerExp for $ty {
+                fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
+                    float_to_exponential_common(fmt, self, false)
+                }
             }
-        }
 
-        #[stable(feature = "rust1", since = "1.0.0")]
-        impl UpperExp for $ty {
-            fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
-                float_to_exponential_common(fmt, self, true)
+            #[stable(feature = "rust1", since = "1.0.0")]
+            impl UpperExp for $ty {
+                fn fmt(&self, fmt: &mut Formatter<'_>) -> Result {
+                    float_to_exponential_common(fmt, self, true)
+                }
             }
-        }
-    };
+        )*
+    )
 }
 
-floating! { f32 }
-floating! { f64 }
+floating! { f32 f64 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Debug for f16 {

library/core/src/fmt/nofloat.rs

@@ -1,18 +1,16 @@
 use crate::fmt::{Debug, Formatter, Result};
 
 macro_rules! floating {
-    ($ty:ident) => {
+    ($($ty:ident)*) => (
+    $(
         #[stable(feature = "rust1", since = "1.0.0")]
         impl Debug for $ty {
             #[inline]
             fn fmt(&self, _fmt: &mut Formatter<'_>) -> Result {
-                panic!("floating point support is turned off");
+                panic!("floating point fmt support is turned off");
             }
-        }
-    };
+        })*
+    )
 }
 
-floating! { f16 }
-floating! { f32 }
-floating! { f64 }
-floating! { f128 }
+floating! { f16 f32 f64 f128 }