Am I missing something or should this be able to compile? I don't know where it is even using ~=, is it used internally for ranges?

struct T
{
@nogc:

auto opBinary(string op, V)(auto ref const(V) vec) const
{
    // Error: cannot use operator ~= in @nogc delegate onlineapp.T.opBinary!("+", T).opBinary.__lambda2
    static foreach(i ; 0 .. 1)
    {
    }
    return this;
}
}

void main() {
    T a, b;
    T c = a + b;
}


https://run.dlang.io/is/JDXcJj

Bug report please. That shouldn't be happening.

On 2019-05-30 04:56, Exil wrote:
> 
> Am I missing something or should this be able to compile? I don't know where it is even using ~=, is it used internally for ranges?
> 
> struct T
> {
> @nogc:
> 
> auto opBinary(string op, V)(auto ref const(V) vec) const
> {
>      // Error: cannot use operator ~= in @nogc delegate onlineapp.T.opBinary!("+", T).opBinary.__lambda2
>      static foreach(i ; 0 .. 1)
>      {
>      }
>      return this;
> }
> }
> 
> void main() {
>      T a, b;
>      T c = a + b;
> }
> 
> 
> https://run.dlang.io/is/JDXcJj

Looks like there are two issues here:

1. That "static foreach" cannot be used in a @nogc function
2. That the error message mentions "delegate", which are not in the source code

-- 
/Jacob Carlborg

On Thursday, 30 May 2019 at 02:56:16 UTC, Exil wrote:
> Am I missing something or should this be able to compile?

It's a known bug: https://issues.dlang.org/show_bug.cgi?id=18439

On 30.05.19 17:02, Jacob Carlborg wrote:
> On 2019-05-30 04:56, Exil wrote:
>>
>> Am I missing something or should this be able to compile? I don't know where it is even using ~=, is it used internally for ranges?
>>
>> struct T
>> {
>> @nogc:
>>
>> auto opBinary(string op, V)(auto ref const(V) vec) const
>> {
>>      // Error: cannot use operator ~= in @nogc delegate onlineapp.T.opBinary!("+", T).opBinary.__lambda2
>>      static foreach(i ; 0 .. 1)
>>      {
>>      }
>>      return this;
>> }
>> }
>>
>> void main() {
>>      T a, b;
>>      T c = a + b;
>> }
>>
>>
>> https://run.dlang.io/is/JDXcJj
> 
> Looks like there are two issues here:
> 
> 1. That "static foreach" cannot be used in a @nogc function
> 2. That the error message mentions "delegate", which are not in the source code
> 

The only issue here is that `@nogc:` applies to all nested functions, including delegates that are only used for CTFE.

On Thursday, 30 May 2019 at 15:11:31 UTC, Dennis wrote:
> On Thursday, 30 May 2019 at 02:56:16 UTC, Exil wrote:
>> Am I missing something or should this be able to compile?
>
> It's a known bug: https://issues.dlang.org/show_bug.cgi?id=18439

Fixed in https://github.com/dlang/dmd/pull/9922

On 2019-05-30 17:29, Timon Gehr wrote:

> The only issue here is that `@nogc:` applies to all nested functions, including delegates that are only used for CTFE.

You don't see it has a problem that the compiler mentions "delegate" in an error message but "delegate" doesn't exist in the source code?

-- 
/Jacob Carlborg

On 04.06.19 19:58, Jacob Carlborg wrote:
> On 2019-05-30 17:29, Timon Gehr wrote:
> 
>> The only issue here is that `@nogc:` applies to all nested functions, including delegates that are only used for CTFE.
> 
> You don't see it has a problem that the compiler mentions "delegate" in an error message but "delegate" doesn't exist in the source code?
> 

The problem is that there is an error message at all.

On 31.05.19 05:40, Nicholas Wilson wrote:
> On Thursday, 30 May 2019 at 15:11:31 UTC, Dennis wrote:
>> On Thursday, 30 May 2019 at 02:56:16 UTC, Exil wrote:
>>> Am I missing something or should this be able to compile?
>>
>> It's a known bug: https://issues.dlang.org/show_bug.cgi?id=18439
> 
> Fixed in https://github.com/dlang/dmd/pull/9922

Disgusting.