[Issue 12593] New: [REG2.065] AA cannot have struct as key

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12593

          Issue ID: 12593
           Summary: [REG2.065] AA cannot have struct as key
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: yazan.dabain at gmail.com

Code:

int[R] aa;
struct R {}
void main() {}

Compiler output:

test.d(1): Error: associative array key type R does not have 'const int
opCmp(ref const R)' member function

which is understandable. However, let's add the missing member function.

Code:

int[R] aa;
struct R {
  const int opCmp(ref const R) { return 0; }
}
void main() {}

Compiler output:

test.d(1): Error: associative array key type R does not have 'const int
opCmp(ref const R)' member function

We still have the same error although the member function exists! I tried
adding opEquals and toHash functions too, but I get the same output.

Now let's try the following:

Code:

import std.array; // can be other modules also (e.g. range, algorithm, string,
format) but not all modules enable this code to compile (e.g. typetuple)
int[R] aa;
struct R {}
void main() {}

Now with having some arbitrary import, the code compiles! Although opCmp is
missing.

--