• d-bugmail puremagic.com (41/41) Jan 01 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9252

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=9252

           Summary: Wrong error message in a case of alias-this-array
                    indexing with double value
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This program shows a correct error message:

void main() {
    int[5] a;
    double i = 0;
    a[i] = 0;
}


test.d(4): Error: cannot implicitly convert expression (i) of type double to
uint


While this code in a similar case shows a not good error message:


struct Foo {
    int[] data = [0];
    alias this = data;
}
void main() {
    Foo a;
    int i1 = 0;
    a[i1] = 10; // OK.
    assert(a.data[0] == 10);
    double i2 = 0;
    a[i2] = 20; // Error.
}


DMD 2.061alpha gives:

test.d(11): Error: no [] operator overload for type Foo

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