[Issue 20439] New: memoize fails with types that have a void opAssign

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20439

          Issue ID: 20439
           Summary: memoize fails with types that have a void opAssign
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: ali.akhtarzada at gmail.com

struct S(T) {
    void opAssign(T)(T) {}
}

S!int f() {
    return S!int();
}

void main()
{
    alias test = memoize!f;
}

functional.d(1138): Error: return expression expected

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