[Issue 250] New: enum : bool allowed with odd results

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=250

           Summary: enum : bool allowed with odd results
           Product: D
           Version: 0.162
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: accepts-invalid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: jpelcis at gmail.com


module test;

import std.stdio;

enum Bool : bool {
        False,
        True,
        Unknown
}

void main () {
        writefln("The maximum value of bool is %d.", bool.max);
        writefln("The maximum value of Bool is %d.", cast(int)Bool.max);
        writefln("    Also, should that cast be necessary?\n");

        writefln("Using 2 as a bool gives %d.", cast(bool)2);
        writefln("Using 2 as a Bool gives %d.", cast(int)cast(Bool)2);
        writefln("Using Bool.Unknown as an int gives %d.",
cast(int)Bool.Unknown);
        writefln("Using Bool.Unknown as a bool gives %d.",
cast(bool)Bool.Unknown);
}

-----------------------------

Running this gives me the following data:

-----------------------------

The maximum value of bool is 1.
The maximum value of Bool is 1.
    Also, should that cast be necessary?

Using 2 as a bool gives 1.
Using 2 as a Bool gives 1.
Using Bool.Unknown as an int gives 1.
Using Bool.Unknown as a bool gives 2.

-----------------------------

This is either accepts-invalid or wrong-code, depending on whether enum : bool
is legal.

Also, I must admit to being curious why casting Bool.Unknown to an int gives 1
while casting it to a bool gives 2.  Is cast ignored for enum to base type?


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