[Issue 9430] New: short and byte implicitly cast to integer with binary arithmetic ops

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9430

           Summary: short and byte implicitly cast to integer with binary
                    arithmetic ops
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: estewh at gmail.com


--- Comment #0 from stewart <estewh at gmail.com> 2013-01-31 14:52:44 EST ---
This fails to compile with the (equivalent) errors shown below:

void main() {
    byte[3] val = [1, 2, 3];
    byte[3] res2;
    res[0] = val[1]+val[2];  // Error A
    res[0] = val[1]-val[2];  // Error A
    res[0] = val[1]/val[2];  // Error A

    byte a1 = 1, a2 = 2;
    byte result = a1+a2;     // Error B
    assert(result == 4);

    result = a1;
    result += a2;    // OK

    res[0] = val[1];
    res[0] += val[2];  // OK
    res[0] = val[1];
    res[0] -= val[2];  // OK
    res[0] = val[1];
    res[0] *= val[2];  // OK
    res[0] = val[1];
    res[0] /= val[2];  // OK
} 


Error A: cannot implicitly convert expression (cast(int)val[1UL] +
cast(int)val[2UL] ) of type int to byte.

Error B: cannot implicitly convert expression (cast(int)a1 + cast(int)a2 ) of
type int to byte.


Same is true for short[] arrays. It is true for +, -, *, /

NOTE: It is not the case for +=, -=, *= and /=. These work with byte and short

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