Bug 19141 – Destructors are called for multiple anonymous union members

Example code: --- import std.stdio: writeln; struct S1 { ~this() { writeln("Destroying S1"); } } struct S2 { ~this() { writeln("Destroying S2"); } } struct S3 { union { S1 one; S2 two; } ~this() { writeln("Destroying S3"); } } void main() { S3 three; } --- Output: Destroying S3 Destroying S2 Destroying S1 Since `one` and `two` are members of the same union, calling both destructors will always lead to undefined behavior. Changing the anonymous union to a named union causes both the S1 and S2 destructor calls to be omitted. Possibly related to Issue 4421.

*** This issue has been marked as a duplicate of issue 19122 ***