problem using std.format on Arm

[Jeremiah Glover]

I've been wanting to put together a programming to teach D. The 
raspberry pi seemed like a good computer to use so everyone could 
be guaranteed to have a computer to practice on. I've had some 
trouble, however, getting a test project to compile, and the 
first culprit lives in std.format.

I tried both LDC and GDC by using `sudo apt install ldc` and 
`sudo apt install gdc`

compiling my test file with ldc gives these errors

/usr/lib/ldc/arm-linux-gnueabihf/include/d/std/format.d(620): 
Error: can only * a pointer, not a 'int'
/usr/lib/ldc/arm-linux-gnueabihf/include/d/std/format.d(631): 
Error: can only * a pointer, not a 'int'
/usr/lib/ldc/arm-linux-gnueabihf/include/d/std/format.d(620): 
Error: using * on an array is no longer supported; use 
*(_param_2).ptr instead
/usr/lib/ldc/arm-linux-gnueabihf/include/d/std/format.d(631): 
Error: using * on an array is no longer supported; use 
*(_param_2).ptr instead
/usr/lib/ldc/arm-linux-gnueabihf/include/d/std/format.d(633): 
Error: template instance std.format.formattedRead!(char[], char, 
string) error instantiating
diceware.d(26):        instantiated from here: 
formattedRead!(char[], char, int, string)
diceware.d(39): Error: template std.format.formattedRead cannot 
deduce function from argument types !()(string, string, int), 
candidates are:
/usr/lib/ldc/arm-linux-gnueabihf/include/d/std/format.d(588):     
    std.format.formattedRead(R, Char, S...)(ref R r, const(Char)[] 
fmt, S args)

compiling with gdc gives these errors:

/usr/lib/gcc/arm-linux-gnueabihf/6/include/d/std/format.d:618:26: 
error: can only * a pointer, not a 'int'
          alias A = typeof(*args[0]);
                           ^
/usr/lib/gcc/arm-linux-gnueabihf/6/include/d/std/format.d:629:13: 
error: can only * a pointer, not a 'int'
              *args[0] = unformatValue!(A)(r, spec);
              ^
/usr/lib/gcc/arm-linux-gnueabihf/6/include/d/std/format.d:618:26: 
error: using * on an array is no longer supported; use 
*(_param_2).ptr instead
          alias A = typeof(*args[0]);
                           ^
/usr/lib/gcc/arm-linux-gnueabihf/6/include/d/std/format.d:629:13: 
error: using * on an array is no longer supported; use 
*(_param_2).ptr instead
              *args[0] = unformatValue!(A)(r, spec);
              ^
/usr/lib/gcc/arm-linux-gnueabihf/6/include/d/std/format.d:631:33: 
error: template instance std.format.formattedRead!(char[], char, 
string) error instantiating
          return 1 + formattedRead(r, spec.trailing, args[1 .. $]);
                                  ^
/home/pi/diceware/diceware.d:26:22: note: instantiated from here: 
formattedRead!(char[], char, int, string)
          formattedRead(line, "%d\t%s", dummy, word);
                       ^
/home/pi/diceware/diceware.d:39:18: error: template 
std.format.formattedRead cannot deduce function from argument 
types !()(string, string, int), candidates are:
      formattedRead(readln.strip, "%d", num_words);
                   ^
/usr/lib/gcc/arm-linux-gnueabihf/6/include/d/std/format.d:586:6: 
note: std.format.formattedRead(R, Char, S...)(ref R r, 
const(Char)[] fmt, S args)
  uint formattedRead(R, Char, S...)(ref R r, const(Char)[] fmt, S 
args)

You can find my test file and a text file that makes the program 
work at https://github.com/d-us-vb/diceware. It compiles without 
warning on my (x86) laptop.

Looking at format.d on the RPi and on my laptop, I noticed that 
the desktop version of phobos doesn't have those places of trying 
to dereference an array element, so I tried replacing format.d on 
my raspberry pi with the format.d I have on my laptop. This 
produced some other errors, which I won't bother posting yet.

What can I do to fix this and get the most recent version of 
phobos that will compile?