Backport "Add regression test for issue #15715" to LTS (#19053)

Backports #18105 to the LTS branch.

PR submitted by the release tooling.
[skip ci]

Author: Kordyjan

tests/pos/i15715.scala

@@ -0,0 +1,7 @@
+import scala.quoted.*
+
+def macroImpl(using Quotes) =
+  val expr = Expr(1)
+  Some((1, 2)).map { (x, y) =>
+    '{ ${expr} + 1 }
+  }