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fixes #25123; fixes #11862 follow up https://github.com/nim-lang/Nim/pull/24442 ref https://github.com/nim-lang/Nim/pull/24441 > To fix this, fields from inactive branches are now detected in semmacrosanity.annotateType (called in fixupTypeAfterEval) and marked to prevent the codegen of their assignments. In https://github.com/nim-lang/Nim/pull/24441 these fields were excluded from the resulting node, but this causes issues when the node is directly supposed to go back into the VM, for example as const values. I don't know if this is the only case where this happens, so I wasn't sure about how to keep that implementation working. Object variants fields coming from inactive branches from VM are now flagged `nfPreventCg`. We can ignore them, as done by the C backends.