https://issues.dlang.org/show_bug.cgi?id=21881

Blatnik <blatblatnik@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Array operation fails to    |Array operation fails to
                   |compile even though it      |compile even though it
                   |really shouldn'             |really should

--- Comment #1 from Blatnik <blatblatnik@gmail.com> ---
float[3] add42(float[3] a)
{
    return a[] + 42;
}

Fails to compile with "Error: array operation `a[] + cast(float)3` without destination memory not allowed."

But

float[3] add42(float[3] a)
{
    float[3] result = a[] + 42;
    return result;
}

compiles just fine. I'm not sure if this is a bug, but if it was intended, I don't see a reason why we couldn't do that.

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https://issues.dlang.org/show_bug.cgi?id=21881

--- Comment #2 from Blatnik <blatblatnik@gmail.com> ---
I also don't understand why the error message I get from that is different from other useless statements. For example:

1 + 1; // Error: `1 + 1` has no effect

int[1] i = [1];
i[] + i[]; // Error: array operation `i[] + i[]` without destination memory not
allowed.

I would have expected the same error message for both of these. It just seems like an inconsistency though, and not an actual problem.

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https://issues.dlang.org/show_bug.cgi?id=21881

--- Comment #3 from Blatnik <blatblatnik@gmail.com> ---
I just realized that this is especially annoying when dealing with multi-dimensional arrays.

float[2] row0 = [1, 2];
float[2] row1 = [3, 4];

float[2][2] matrix = [
  row0[] + row0[], // Error: array operation without destination memory not
allowed.
  row1[] + row1[]  // Error: array operation without destination memory not
allowed.
];

The error message says there is no destination memory even though there clearly is.

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https://issues.dlang.org/show_bug.cgi?id=21881

Ketmar Dark <ketmar@ketmar.no-ip.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ketmar@ketmar.no-ip.org

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https://issues.dlang.org/show_bug.cgi?id=21881

Imperatorn <johan_forsberg_86@hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |johan_forsberg_86@hotmail.c
                   |                            |om

--- Comment #4 from Imperatorn <johan_forsberg_86@hotmail.com> ---
This one is annoying. Also, imo we should allow these kinds of operations using temporaries.

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https://issues.dlang.org/show_bug.cgi?id=21881

Iain Buclaw <ibuclaw@gdcproject.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P1                          |P4

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https://issues.dlang.org/show_bug.cgi?id=21881

--- Comment #5 from dlangBugzillaToGithub <robert.schadek@posteo.de> ---
THIS ISSUE HAS BEEN MOVED TO GITHUB

https://github.com/dlang/dmd/issues/19914

DO NOT COMMENT HERE ANYMORE, NOBODY WILL SEE IT, THIS ISSUE HAS BEEN MOVED TO GITHUB

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