[Issue 20959] New: Indexing a pointer of a fwd-declared struct type is NOT a frontend error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20959

          Issue ID: 20959
           Summary: Indexing a pointer of a fwd-declared struct type is
                    NOT a frontend error
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: kinke at gmx.net

struct S;

ref foo(S* s)
{
    static assert(__traits(compiles, s[1])); // should fail
    return s[1]; // ICE for LDC, for DMD: Error: struct `onlineapp.S` unknown
size
}

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