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Due to the known limitations of .set reassignment (see https://sourceware.org/PR288), we use diagnostics to reject patterns that could lead to errors (ae7ac010594f693fdf7b3ab879e196428d961e75 2009-06)). This code gets refined multiple times, see: * 9b4a824217f1fe23f83045afe7521acb791bc2d0 (2010-05) `IsUsedInExpr` * 46c79ef1132607aead144dfda0f26aa8b065214f (2010-11) renamed `IsUsedInExpr` to `IsUsed` The related `SetUsed` bit seems unnecessary nowadays.
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