fix more tests

Author: bishabosha

tests/pos-macros/splice-with-explicit-context.scala

@@ -2,6 +2,6 @@ import scala.quoted._
 
 def f(a: Expr[Int])(using q: Quotes): Unit =
 
-  '{ val x: Int = ${ (using q2) => a } }
+  '{ val x: Int = ${ (q2) ?=> a } }
 
-  '{ val x: Int = ${ (using q2: q.Nested) => a } }
+  '{ val x: Int = ${ (q2: q.Nested) ?=> a } }

tests/run-staging/multi-staging.scala

@@ -13,7 +13,7 @@ object Test {
       println(run(s1))
     }
   def stage1(x: Expr[Int])(using Quotes): Expr[Quotes ?=> Expr[Int]] =
-    val code = '{ (using q1: Quotes) =>
+    val code = '{ (q1: Quotes) ?=>
       val x1 = $x
       '{ 1 + ${Expr(x1)} }
     }

tests/run-staging/quote-nested-4.scala

@@ -5,7 +5,7 @@ object Test {
   given Toolbox = Toolbox.make(getClass.getClassLoader)
   def main(args: Array[String]): Unit = withQuotes {
 
-    val q = '{ (using q: Quotes) =>
+    val q = '{ (q: Quotes) ?=>
       val t = Type.of[String]
       t
     }

tests/run/i10016.scala

@@ -2,4 +2,4 @@ def f(init: Int ?=> Int) : Int = 1
 def f(s: String)(init: Int ?=> Int) : Int = 2
 
 @main def Test() =
-  assert(f((using x:Int) => x) == 1)
+  assert(f((x: Int) ?=> x) == 1)