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+ import scala .quoted ._
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+
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+ def f (foo : Any => Any )(using Quotes ): Expr [Any ] =
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+ ' { println($ { foo[Int ](' {??? }); ??? }) } // error
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+ package x
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+
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+ import scala .quoted ._
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+
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+ object Impl {
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+
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+ sealed trait UpdateOp [+ T ]
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+ case class Assignment [T ](value: Expr [T ]) extends UpdateOp [T ]
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+ case class Update (operation: Expr [Unit ]) extends UpdateOp [Nothing ]
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+
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+ def genRead [B : Type ](newBuilder : Expr [B ],
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+ readVal : (Expr [B ]) => UpdateOp [B ]
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+ )(using Quotes ): Expr [B ] =
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+ ' {
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+ var x = $newBuilder
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+ $ {readVal[B ](' x ) match { // error: method apply in trait Function1 does not take type parameters
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+ case Assignment (value) => ' { x = $value } // error
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+ case Update (operation) => operation // error
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+ }}
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+ x
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+ }
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+
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+ }
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