Merge pull request #4984 from moiseev/floating-availability-ccc

[stdlib] availability attributes for floating point types

Author: tkremenek

stdlib/public/core/FloatingPoint.swift.gyb

@@ -1911,10 +1911,6 @@ extension BinaryFloatingPoint {
     return true
   }
 
-  @available(*, unavailable, renamed: "isSignalingNaN")
-  public var isSignaling: Bool {
-    return isSignalingNaN
-  }
 
   /*  TODO: uncomment these default implementations when it becomes possible
       to use them.
@@ -1954,5 +1950,33 @@ extension BinaryFloatingPoint {
   */
 }
 
+extension FloatingPoint {
+  @available(*, unavailable, message: "Use bitPattern property instead")
+  public func _toBitPattern() -> UInt {
+    fatalError("unavailable")
+  }
+
+  @available(*, unavailable, message: "Use init(bitPattern:) instead")
+  public static func _fromBitPattern(_ bits: UInt) -> Self {
+    fatalError("unavailable")
+  }
+}
+
+extension BinaryFloatingPoint {
+  @available(*, unavailable, renamed: "isSignalingNaN")
+  public var isSignaling: Bool {
+    fatalError("unavailable")
+  }
+
+  @available(*, unavailable, renamed: "nan")
+  public var NaN: Bool {
+    fatalError("unavailable")
+  }
+  @available(*, unavailable, renamed: "nan")
+  public var quietNaN: Bool {
+    fatalError("unavailable")
+  }
+}
+
 @available(*, unavailable, renamed: "FloatingPoint")
 public typealias FloatingPointType = FloatingPoint