Add objects around neg tests

Author: Sporarum

tests/neg/_TypeInterweaving/ab.scala

@@ -1,8 +1,8 @@
+object Ab:
+    given String = ""
+    given Double = 0
 
-given String = ""
-given Double = 0
+    def ab[A][B](x: A)(using B): B = summon[B]
 
-def ab[A][B](x: A)(using B): B = summon[B]
-
-def test =
-    ab[Int](0: Int) // error
+    def test =
+        ab[Int](0: Int) // error

tests/neg/_TypeInterweaving/nameCollision.scala

@@ -1,2 +1,3 @@
-def f[T](x: T)[U](y: U) = (x,y)
-def f[T](x: T, y: T) = (x,y) // error
+object nameCollision:
+    def f[T](x: T)[U](y: U) = (x,y)
+    def f[T](x: T, y: T) = (x,y) // error

tests/neg/_TypeInterweaving/unmatched.scala

@@ -0,0 +1,4 @@
+object unmatched:
+    def f1[T (x: T)] = ??? // error
+    def f2[T(x: T) = ??? // error
+    def f3(x: Any[)T] = ??? // error