Merge pull request #8477 from dotty-staging/fix-#7403

Fix #7403: Add regression test

Author: liufengyun

tests/pos-macros/i7322/Macro_1.scala

@@ -0,0 +1,7 @@
+import scala.quoted.{ QuoteContext, Expr, Type }
+
+trait M[T] {
+  def f: Any
+}
+
+inline def g[T: Type](em: Expr[M[T]])(using QuoteContext) = '{$em.f}

tests/pos-macros/i7322/Test_2.scala

@@ -0,0 +1,8 @@
+object Test {
+
+  extension on (i: Int):
+    def pow2 = i * i
+
+  println(5.pow2)
+
+}