It doesn't throw any error

import std.stdio;

void main()
{
    int id = IdWrap().getID;
    writeln("use: ", id);
}

struct IdWrap
{
    private int _id;

    int getID() return
    {
    	return _id;
    }

    ~this(){
    	writeln("delete id:(");
    }
}

Moreover, if you return this.someSlice.ptr in the return method in a structure, there will also be no error.

You're not returning a pointer and you're not returning by ref, so return is ignored.

On Sunday, 1 May 2022 at 21:09:14 UTC, mesni wrote:

What error do you expect?

On Sunday, 1 May 2022 at 21:09:14 UTC, mesni wrote:

import std.stdio;

void main()
{
    int id = IdWrap().getID;
    writeln("use: ", id);
}

struct IdWrap
{
    private int _id;

    int getID() return
    {
    	return _id;
    }

    ~this(){
    	writeln("delete id:(");
    }
}

return attribute has effect only if return type of function has indirection. For basic types like int has no effect.

Example:

import std.stdio;

void main()@safe
{
    int* id = IdWrap().getID;  //Error: address of variable `__slIdWrap40` assigned to `id` with longer lifetime
    writeln("use: ", id);
}

struct IdWrap
{
    private int _id;

    @property int* getID()@safe return
    {
    	return &_id;
    }

    ~this()@safe{
    	writeln("delete id:(");
    }
}