[Issue 10973] New: emplace internal error

d-bugmail at puremagic.com d-bugmail at puremagic.com
Thu Sep 5 10:27:27 PDT 2013


http://d.puremagic.com/issues/show_bug.cgi?id=10973

           Summary: emplace internal error
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: regression
          Priority: P2
         Component: Phobos
        AssignedTo: monarchdodra at gmail.com
        ReportedBy: monarchdodra at gmail.com


--- Comment #0 from monarchdodra at gmail.com 2013-09-05 10:27:26 PDT ---
Conditions: Use aggregate initialization on a structure that has a static
array, while making the argument an element type of the array. EG:

//----
import std.conv;

struct S
{
    int i;
    int[2] ii;
}

void main()
{
    S s = S(1, 2); //OK
    emplace(&s, 1, 2); //Chokes
}
//----

The issue is in "emplacePostblitter", which is confused when it is asked to
postblit a type over something that isn't the same type.

"Luckilly", compilation stops, instead of potentially doing wrong code.

On topic, I'm really not a huge fan of "S s = S(1, 2); //OK": This is basically
implicit promotion from "int" to "int[2]". D usually bans implicit pormotion,
and *every time* I have seen this "aggregate initialization with static array
promotion" "feature" I (and others on the boards) have been surprised by it.

Introduced by pull:
https://github.com/D-Programming-Language/phobos/pull/1082

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