Add regression test

Closes #11162

Author: nicolasstucki

tests/run-staging/i11162.scala

@@ -0,0 +1,15 @@
+import scala.quoted.*
+
+object Test {
+
+  given staging.Compiler = staging.Compiler.make(getClass.getClassLoader)
+
+  def main(args: Array[String]): Unit =
+    staging.run {
+      '{ foo() }
+    }
+
+  inline def foo(): Unit = ${ fooExpr() }
+
+  private def fooExpr()(using Quotes): Expr[Unit] = '{ println("foo") }
+}