gcc/testsuite/gdc.test/fail_compilation/ice12902.d

/*
TEST_OUTPUT:
---
fail_compilation/ice12902.d(20): Error: variable ice12902.main.__dollar type void is inferred from initializer s.opDollar(), and variables cannot be of type void
fail_compilation/ice12902.d(20): Error: expression s.opDollar() is void and has no value
---
*/

struct S
{
    void opDollar() { }
    void opIndex() { }
    void opIndexAssign() { }
    void opSliceAssign() { }
}

void main()
{
    S s;
    s[] = s[$];
}