Fix syntax change

Author: liufengyun

tests/init/crash/i6914.scala

@@ -2,10 +2,10 @@ trait Expr[T]
 trait Liftable[T]
 
 object test1 {
-  class ToExpr[T](given Liftable[T]) extends Conversion[T, Expr[T]] {
+  class ToExpr[T](using Liftable[T]) extends Conversion[T, Expr[T]] {
     def apply(x: T): Expr[T] = ???
   }
-  given toExprFun[T](given Liftable[T]): ToExpr[T]
+  given toExprFun[T](using Liftable[T]) as ToExpr[T]
 
   given Liftable[Int] = ???
   given Liftable[String] = ???
@@ -18,7 +18,7 @@ object test1 {
 
 object test2 {
 
-  given autoToExpr[T](given Liftable[T]) : Conversion[T, Expr[T]] {
+  given autoToExpr[T](using Liftable[T]) as Conversion[T, Expr[T]] {
     def apply(x: T): Expr[T] = ???
   }