Backport "Add regression test for #19909" to LTS (#20981)

Backports #19915 to the LTS branch.

PR submitted by the release tooling.
[skip ci]

tests/pos-macros/i19909/Macro_1.scala

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+package examples.select
+
+import scala.language.dynamics
+import scala.quoted.*
+
+case class Wrapper[A](inner: A) extends Dynamic:
+  transparent inline def selectDynamic(inline name: String) =
+    ${selectDynamicImpl('inner, 'name)}
+
+def selectDynamicImpl[A:Type](inner: Expr[A], name: Expr[String])(using quotes: Quotes): Expr[Any] =
+  import quotes.reflect.*
+  Select.unique(inner.asTerm, name.valueOrAbort).asExpr

tests/pos-macros/i19909/Test_2.scala

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+package examples.select
+
+
+import scala.language.dynamics
+import examples.select.Wrapper
+
+object Dynamic0:
+
+  @main
+  def runTimeError =
+
+    val w = Wrapper(Option(1))
+    println(w.isEmpty)
+
+end Dynamic0

tests/pos-macros/i19909b/Macro.scala

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+package examples.select
+
+import scala.language.dynamics
+import scala.quoted.*
+
+case class Wrapper[A](inner: A) extends Dynamic:
+  transparent inline def selectDynamic(inline name: String) =
+    ${selectDynamicImpl('inner, 'name)}
+
+def selectDynamicImpl[A:Type](inner: Expr[A], name: Expr[String])(using quotes: Quotes): Expr[Any] =
+  import quotes.reflect.*
+  Select.unique(inner.asTerm, name.valueOrAbort).asExpr

tests/pos-macros/i19909b/Test.scala

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+package examples.select
+
+
+import scala.language.dynamics
+import examples.select.Wrapper
+
+object Dynamic0:
+
+  @main
+  def runTimeError =
+
+    val w = Wrapper(Option(1))
+    println(w.isEmpty)
+
+end Dynamic0