• d-bugmail puremagic.com (33/33) Apr 03 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4058
• d-bugmail puremagic.com (14/14) Oct 20 2012 http://d.puremagic.com/issues/show_bug.cgi?id=4058
• d-bugmail puremagic.com (8/8) Jan 01 2013 http://d.puremagic.com/issues/show_bug.cgi?id=4058
• d-bugmail puremagic.com (20/20) Jan 01 2013 http://d.puremagic.com/issues/show_bug.cgi?id=4058

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=4058

           Summary: Wrong error message with __traits(getMember
           Product: D
           Version: future
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



struct Test {
    void hello() {}
}
void main() {
    Test t;
    string m = "hello";
    __traits(getMember, t, m)(); // line 7
}


dmd 2.042 gives:

test.d(7): Error: string expected as second argument of __traits getMember
instead of m
test.d(7): Error: function expected before (), not false of type bool


Defining m as const,immutable or enum string avoids this error. So those two
error messages are bad. Something better can be:

test.d(7): Error: the second argument of __traits getMember must be a not
mutable string.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=4058


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |andrej.mitrovich gmail.com
         Resolution|                            |FIXED



08:48:55 PDT ---
It now gives this generic error first:
test.d(7): Error: variable m cannot be read at compile time

I think that's clearer now.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=4058


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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |WORKSFORME


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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=4058




Now this code:


struct Test {
    void hello() {}
}
void main() {
    Test t;
    string m = "hello";
    auto x = __traits(getMember, t, m); // line 7
}


Prints:

test2.d(7): Error: variable m cannot be read at compile time
test2.d(7): Error: string expected as second argument of __traits getMember
instead of m

I think the second error message should be inhibited, but this situation is
acceptable.

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