std/functional.d

@@ -1814,7 +1814,7 @@ if (isCallable!(F))
     {
         return fp;
     }
-    else static if (is(F Func == Func*) && is(Func == function) && is(Func Params == __parameters))
+    else static if (is(F Func == Func*) && is(Func == function))
     {
         return () @trusted
         {
@@ -1996,6 +1996,22 @@ private template buildDelegate(F)
     assert(toDelegate(i2)(0xBED) == 0xBED);
 }
 
+@safe unittest
+{
+    static void fun() @system pure nothrow @nogc
+    {
+        return;
+    }
+
+    auto fn = &fun;
+    static assert( is(typeof(fn) == void function() @system pure nothrow @nogc));
+    static assert(!is(typeof(fn) == void function() @safe   pure nothrow @nogc));
+
+    auto dg = (() @safe => fn.toDelegate())();
+    static assert( is(typeof(dg) == void delegate() @system pure nothrow @nogc));
+    static assert(!is(typeof(dg) == void delegate() @safe   pure nothrow @nogc));
+}
+
 /**
  * Passes the fields of a struct as arguments to a function.
  *