[Issue 9011] New: One more strongly pure case

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9011

           Summary: One more strongly pure case
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2012-11-12 15:56:39 PST ---
Maybe Hara has already a patch for this, but I don't remember its location.

I think it's good to refine the D purity to allow this code:


int[] foo1(int x) pure {
    return null;
}
ubyte[] foo2(string s) pure {
    return null;
}
void main() {
    immutable a1 = foo1(10); // OK
    immutable a2 = foo2("hello"); // currently error
}



Currently in DMD 2.061alpha it gives:

test.d(9): Error: cannot implicitly convert expression (foo2("hello")) of type
ubyte[] to immutable(ubyte[])


This enhancement means that foo2 becomes strongly pure.

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