[Issue 22949] New: compiler error: struct with __traits(compiles, this.init), nonexistent import mixin, main calls nonexistent enum from other module

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22949

          Issue ID: 22949
           Summary: compiler error: struct with __traits(compiles,
                    this.init), nonexistent import mixin, main calls
                    nonexistent enum from other module
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: default_357-line at yahoo.de

... leads to "Error: unknown."

This may win points for most esoteric repro steps ever.

And yes, this is dustmited from real code. Not AFL.

Consider a test.d:

struct Struct
{
    enum e = __traits(compiles, Struct.init);
    import test2 : NonexistentSymbol;
    mixin NonexistentSymbol;
}

import test2;
void main() { bla; }

And a test2.d:

enum bla = bloop;

Then

Error: unknown, please file report on issues.dlang.org

( see https://run.dlang.io/is/CXi4df )

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