Revert "fix #30462, update function_type tests to understand covariant generics"

tests/language_2/function_type/function_type4_test.dart

Index: tests/language_2/function_type/function_type4_test.dart
diff --git a/tests/language_2/function_type/function_type4_test.dart b/tests/language_2/function_type/function_type4_test.dart
index a5b8533d26c0cf190a88859dc68f9df9f37165ed..445b01c9023d6869958323bc0e5010be809eb6b8 100644
--- a/tests/language_2/function_type/function_type4_test.dart
+++ b/tests/language_2/function_type/function_type4_test.dart
@@ -221,10 +221,10 @@ class U4<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m1 is F1<int>);
-      Expect.equals(true, m1 is F1<bool>);
-      Expect.equals(true, confuse(m1) is F1<int>);
-      Expect.equals(true, confuse(m1) is F1<bool>);
+      Expect.equals(tIsInt, m1 is F1<int>);
+      Expect.equals(tIsBool, m1 is F1<bool>);
+      Expect.equals(tIsInt, confuse(m1) is F1<int>);
+      Expect.equals(tIsBool, confuse(m1) is F1<bool>);
     }
   }
 
@@ -319,10 +319,10 @@ class U4<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m4 is F4<int>);
-      Expect.equals(true, m4 is F4<bool>);
-      Expect.equals(true, confuse(m4) is F4<int>);
-      Expect.equals(true, confuse(m4) is F4<bool>);
+      Expect.equals(tIsInt, m4 is F4<int>);
+      Expect.equals(tIsBool, m4 is F4<bool>);
+      Expect.equals(tIsInt, confuse(m4) is F4<int>);
+      Expect.equals(tIsBool, confuse(m4) is F4<bool>);
     }
   }