Checked!({short, ushort, byte, char}, Throw): compilation fails

[kdevel]

Sorry for this lengthy post:

```x.d
void foo (T) ()
{
    import std.experimental.checkedint;
    alias CT = Checked!(T, Throw);
    CT a = CT.min;
    CT x;
    --x;
    CT b = x;
    CT c = a / b;
}

void bar (T) ()
{
    import std.stdio;
    try foo!T ();
    catch (Exception e)
       writefln ("caught <%s>", e.msg);
}

void main ()
{
    bar!byte;
    bar!char;
    bar!ushort;
    bar!short;
    bar!uint;
    bar!int;
    bar!ulong;
    bar!long;
}
```

$ dmd x.d

[...]/linux/bin64/../../src/phobos/std/experimental/checkedint.d(1410): Deprecation: integral promotion not done for `~cast(byte)0`, use '-preview=intpromote' switch or `~cast(int)(cast(byte)0)`
x.d(9): Error: template 
`std.experimental.checkedint.Checked!(byte, 
Throw).Checked.__ctor` cannot deduce function from argument types 
`!()(Checked!(int, Throw))`, candidates are:
[...]/linux/bin64/../../src/phobos/std/experimental/checkedint.d(331):        `__ctor(U)(U rhs)`
x.d(15): Error: template instance `x.foo!byte` error instantiating
x.d(22):        instantiated from here: `bar!byte`
x.d(4): Error: template instance 
`std.experimental.checkedint.Checked!(char, Throw)` does not 
match template declaration `Checked(T, Hook = Abort)`
   with `T = char,
        Hook = Throw`
   must satisfy one of the following constraints:
`       isIntegral!T
        is(T == Checked!(U, H), U, H)`
x.d(15): Error: template instance `x.foo!char` error instantiating
x.d(23):        instantiated from here: `bar!char`
[...]/linux/bin64/../../src/phobos/std/experimental/checkedint.d(1410): Deprecation: integral promotion not done for `~cast(ushort)0u`, use '-preview=intpromote' switch or `~cast(int)(cast(ushort)0u)`
x.d(9): Error: template 
`std.experimental.checkedint.Checked!(ushort, 
Throw).Checked.__ctor` cannot deduce function from argument types 
`!()(Checked!(int, Throw))`, candidates are:
[...]/linux/bin64/../../src/phobos/std/experimental/checkedint.d(331):        `__ctor(U)(U rhs)`
x.d(15): Error: template instance `x.foo!ushort` error 
instantiating
x.d(24):        instantiated from here: `bar!ushort`
[...]/linux/bin64/../../src/phobos/std/experimental/checkedint.d(1410): Deprecation: integral promotion not done for `~cast(short)0`, use '-preview=intpromote' switch or `~cast(int)(cast(short)0)`
x.d(9): Error: template 
`std.experimental.checkedint.Checked!(short, 
Throw).Checked.__ctor` cannot deduce function from argument types 
`!()(Checked!(int, Throw))`, candidates are:
[...]/linux/bin64/../../src/phobos/std/experimental/checkedint.d(331):        `__ctor(U)(U rhs)`
x.d(15): Error: template instance `x.foo!short` error 
instantiating
x.d(25):        instantiated from here: `bar!short`

$ dmd --version
DMD64 D Compiler v2.090.1
Copyright (C) 1999-2019 by The D Language Foundation, All Rights 
Reserved written by Walter Bright

Is Checked expected to work with the types byte, char, ushort and 
short? If so shall I file a bug report?