http://d.puremagic.com/issues/show_bug.cgi?id=6732

           Summary: static assert fails on true expression
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2011-09-26 09:14:17 PDT ---
template isDouble(T) {
    enum bool isDouble = __traits(hasMember, T, "x") || is(T == double);
}

void test(T)(T rhs) if (is(T == int)) { }
void test(T)(T rhs) if (isDouble!T) { }

void main()
{
    static assert(__traits(compiles, test(4.5)));  // fail
    test(4.5);  // fine
}

If you comment out the static assert you'll see that the test() call compiles. Oddly enough if you swap the order of the calls like so:

void main()
{
    test(4.5);
    static assert(__traits(compiles, test(4.5)));
}

Then it works again.

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|rejects-valid               |
            Summary|__traits(compiles) fails on |ICE: __traits(compiles)
                   |valid expression            |fails on valid expression


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-01-04 06:55:23 PST ---
The following has now turned into an ICE (is a crash equivalent to an ICE?) in
2.057:

template isDouble(T)
{
    enum bool isDouble = __traits(hasMember, T, "x");
}

void test(T)(T rhs) if (isDouble!T) { }

void main()
{
    test(4.5);
}

---------------------------
dmd.exe - Application Error
---------------------------
The instruction at "0x00489e61" referenced memory at "0x00000000". The memory could not be "read".

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2012-01-06 07:35:49 PST ---
ICE problem on comment#1 was fixed in bug 7108.
And the original problem on comment#0 was fixed in bug 7123.

Finally this issue was completely fixed in 2.058head.

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