Fix issue #8260 - allow only pointers as formattedRead parameters

Author: byebye

changelog/std-format-formattedRead-only-pointers.dd

@@ -0,0 +1,2 @@
+`std.format.formattedRead` now only accepts pointers as input arguments.
+

std/format.d

@@ -568,6 +568,7 @@ can match the expected number of readings or fewer, even zero, if a
 matching failure happens.
  */
 uint formattedRead(R, Char, S...)(ref R r, const(Char)[] fmt, S args)
+if (allSatisfy!(isPointer, S))
 {
     import std.typecons : isTuple;