Re-enable lost tests

Found in #7906 (comment)

Author: nicolasstucki

tests/pos-custom-args/i4125.scala renamed to tests/pos/i4125.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 object Test {
   def foo: ((erased x: Int, y: Int) => Int) = (erased x, y) => 1
   def bar: ((erased x: Int, y: Int) ?=> Int) = (erased x, y) ?=> 1

tests/pos-custom-args/i4509.scala renamed to tests/pos/i4509.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 object Main {
   def fun[T](op: (erased Int) ?=> T) = op(using 0)
   fun { }

tests/pos-custom-args/i5938.scala renamed to tests/pos/i5938.scala

@@ -1,8 +1,11 @@
+import scala.language.experimental.erasedDefinitions
+
 import compiletime.summonFrom
+import compiletime.erasedValue
 
 trait Link[T, A]
 
-inline def link[T] =
+transparent inline def link[T] =
   summonFrom {
     case _: Link[T, s] =>
       summonFrom {
@@ -12,7 +15,7 @@ inline def link[T] =
 
 class Foo
 object Foo {
-  erased implicit val barLink: Link[Foo, Bar.type] = null
+  erased implicit val barLink: Link[Foo, Bar.type] = erasedValue
 }
 
 implicit object Bar {

tests/pos-custom-args/i6009a.scala renamed to tests/pos/i6009a.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 class Foo {
   def foo(f: (erased Int) => Int): Int = {
     erased val ctx = 1

tests/pos-custom-args/i6009b.scala renamed to tests/pos/i6009b.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 class Foo {
   def foo(f: (erased Int) => Int): Int = {
     erased val ctx = 1

tests/pos-custom-args/i6009c.scala renamed to tests/pos/i6009c.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 class Foo {
   def foo(f: (erased Int) ?=> Int): Int = {
     implicit erased val ctx = 1

tests/pos-custom-args/i6419.scala renamed to tests/pos/i6419.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 class Foo {
   inline def foo: Unit = {
     @scala.annotation.compileTimeOnly("some message") val res = ???

tests/pos-custom-args/i7741.scala renamed to tests/pos/i7741.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 class A1 {
     @native private def a: Unit
 }

tests/pos-custom-args/inline-match-gadt.scala renamed to tests/pos/inline-match-gadt.scala

@@ -1,3 +1,5 @@
+import scala.language.experimental.erasedDefinitions
+
 object `inline-match-gadt` {
   class Exactly[T]
   erased def exactType[T]: Exactly[T] = compiletime.erasedValue

tests/pos-custom-args/matchtype.scala renamed to tests/pos/matchtype.scala

@@ -1,12 +1,14 @@
-import compiletime.*
+import scala.language.experimental.erasedDefinitions
+import compiletime.erasedValue
+import compiletime.ops.int.S
 object Test {
   type T[X] = X match {
     case String => Int
     case Int => String
   }
 
   type Len[X] <: Int = X match {
-    case Unit => 0
+    case EmptyTuple => 0
     case x *: xs => S[Len[xs]]
   }
 
@@ -28,7 +30,7 @@ object Test {
   erased val z1: Head[(Int, String)] = 22
 
   type Concat[X <: Tuple, Y <: Tuple] <: Tuple = X match {
-    case Unit => Y
+    case EmptyTuple => Y
     case x1 *: xs1 => x1 *: Concat[xs1, Y]
   }
 
@@ -55,8 +57,8 @@ object Test {
   erased val y4: Elem[(String, Int, Boolean), 2] = erasedValue[Boolean]
   erased val z4: Boolean = erasedValue[Elem[(String, Int, Boolean), 2]]
 
-  erased val y5: Concat[Unit, (String, Int)] = erasedValue[(String, Int)]
-  erased val z5: (String, Int) = erasedValue[Concat[Unit, (String, Int)]]
+  erased val y5: Concat[EmptyTuple, (String, Int)] = erasedValue[(String, Int)]
+  erased val z5: (String, Int) = erasedValue[Concat[EmptyTuple, (String, Int)]]
   erased val y6: Concat[(Boolean, Boolean), (String, Int)] = erasedValue[Boolean *: Boolean *: (String, Int)]
   erased val z6: Boolean *: Boolean *: (String, Int) = erasedValue[Concat[(Boolean, Boolean), (String, Int)]]
   erased val y7: (Boolean, Boolean, String, Int) = erasedValue[Concat[(Boolean, Boolean), String *: Int *: EmptyTuple]]