Make `incompatible_disallow_toplevel_if_statement` default to true.

RELNOTES: Top-level `if` statements are now forbidden.
PiperOrigin-RevId: 165469101
diff --git a/src/test/java/com/google/devtools/build/lib/syntax/MethodLibraryTest.java b/src/test/java/com/google/devtools/build/lib/syntax/MethodLibraryTest.java
index 85979f4..dd6a46a 100644
--- a/src/test/java/com/google/devtools/build/lib/syntax/MethodLibraryTest.java
+++ b/src/test/java/com/google/devtools/build/lib/syntax/MethodLibraryTest.java
@@ -1329,8 +1329,8 @@
     new SkylarkTest()
         .testEval(
             "d = {1: 'foo', 2: 'bar', 3: 'baz'}\n"
-                + "if len(d) != 3: fail('clear 1')\n"
-                + "if d.clear() != None: fail('clear 2')\n"
+                + "len(d) == 3 or fail('clear 1')\n"
+                + "d.clear() == None or fail('clear 2')\n"
                 + "d",
             "{}");
   }
@@ -1341,12 +1341,12 @@
         .testIfErrorContains(
             "KeyError: 1",
             "d = {1: 'foo', 2: 'bar', 3: 'baz'}\n"
-                + "if len(d) != 3: fail('pop 1')\n"
-                + "if d.pop(2) != 'bar': fail('pop 2')\n"
-                + "if d.pop(3, 'quux') != 'baz': fail('pop 3a')\n"
-                + "if d.pop(3, 'quux') != 'quux': fail('pop 3b')\n"
-                + "if d.pop(1) != 'foo': fail('pop 1')\n"
-                + "if d != {}: fail('pop 0')\n"
+                + "len(d) == 3 or fail('pop 1')\n"
+                + "d.pop(2) == 'bar' or fail('pop 2')\n"
+                + "d.pop(3, 'quux') == 'baz' or fail('pop 3a')\n"
+                + "d.pop(3, 'quux') == 'quux' or fail('pop 3b')\n"
+                + "d.pop(1) == 'foo' or fail('pop 1')\n"
+                + "d == {} or fail('pop 0')\n"
                 + "d.pop(1)");
   }
 
@@ -1356,11 +1356,11 @@
         .testIfErrorContains(
             "popitem(): dictionary is empty",
             "d = {2: 'bar', 3: 'baz', 1: 'foo'}\n"
-                + "if len(d) != 3: fail('popitem 0')\n"
-                + "if d.popitem() != (2, 'bar'): fail('popitem 2')\n"
-                + "if d.popitem() != (3, 'baz'): fail('popitem 3')\n"
-                + "if d.popitem() != (1, 'foo'): fail('popitem 1')\n"
-                + "if d != {}: fail('popitem 4')\n"
+                + "len(d) == 3 or fail('popitem 0')\n"
+                + "d.popitem() == (2, 'bar') or fail('popitem 2')\n"
+                + "d.popitem() == (3, 'baz') or fail('popitem 3')\n"
+                + "d.popitem() == (1, 'foo') or fail('popitem 1')\n"
+                + "d == {} or fail('popitem 4')\n"
                 + "d.popitem()");
   }
 
@@ -1379,11 +1379,11 @@
     new SkylarkTest()
         .testEval(
             "d = {2: 'bar', 1: 'foo'}\n"
-                + "if len(d) != 2: fail('setdefault 0')\n"
-                + "if d.setdefault(1, 'a') != 'foo': fail('setdefault 1')\n"
-                + "if d.setdefault(2) != 'bar': fail('setdefault 2')\n"
-                + "if d.setdefault(3) != None: fail('setdefault 3')\n"
-                + "if d.setdefault(4, 'b') != 'b': fail('setdefault 4')\n"
+                + "len(d) == 2 or fail('setdefault 0')\n"
+                + "d.setdefault(1, 'a') == 'foo' or fail('setdefault 1')\n"
+                + "d.setdefault(2) == 'bar' or fail('setdefault 2')\n"
+                + "d.setdefault(3) == None or fail('setdefault 3')\n"
+                + "d.setdefault(4, 'b') == 'b' or fail('setdefault 4')\n"
                 + "d",
             "{1: 'foo', 2: 'bar', 3: None, 4: 'b'}");
   }