[Issue 6906] Cannot assign value into associative array if contains opAssign

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6906


Kenji Hara <k.hara.pg at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|wrong-code                  |rejects-valid
             Status|NEW                         |RESOLVED
           Platform|Other                       |All
         Resolution|                            |FIXED
         OS/Version|Windows                     |All


--- Comment #4 from Kenji Hara <k.hara.pg at gmail.com> 2013-09-07 10:01:04 PDT ---
(In reply to comment #0)
> This code fails to compile because the struct S implement opAssign and the
> compiler tries using it rather than the associative arrays insert.
> 
>     void main() {
>        S[string] ss;
>        S s;
> 
>        ss["hello"] = s;
>     }
> 
>     struct S {
>        void opAssign(int i) {
>        }
>     }
> 
> test.d(6): Error: function test.S.opAssign (int i) is not callable using
> argument types (S)
> test.d(6): Error: cannot implicitly convert expression (s) of type S to int
> test.d(6): Error: function test.S.opAssign (int i) is not callable using
> argument types (S)
> test.d(6): Error: cannot implicitly convert expression (s) of type S to int
> PS C:\Documents and Settings\jphillips\src\Juno> dmd test.d
> test.d(5): Error: function test.S.opAssign (int i) is not callable using
> argument types (S)
> test.d(5): Error: cannot implicitly convert expression (s) of type S to int
> test.d(5): Error: function test.S.opAssign (int i) is not callable using
> argument types (S)
> test.d(5): Error: cannot implicitly convert expression (s) of type S to int

>From 2.062, the code could work.

Even if a struct has only non-identity opAssign methods, identity assignment
would be rewritten to the field-to-field assignment.

struct S
{
    int val;
    void opAssign(int i) {}
}

void main()
{
    S s;
    S s2;

    s = s2; // Rewite as: s.tupleof = s2.tupleof;
    s = 1;  // Rewrite as: s.opAssign(1)
}

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