Enable --incompatible_disallow_filetype by default.

Fixes #5831

RELNOTES: --incompatible_disallow_filetype is enabled by default.
PiperOrigin-RevId: 233808118
diff --git a/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java b/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
index 30ea540..bb92321 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/SkylarkSemanticsOptions.java
@@ -276,15 +276,14 @@
 
   @Option(
       name = "incompatible_disallow_filetype",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.SKYLARK_SEMANTICS,
       effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
       metadataTags = {
         OptionMetadataTag.INCOMPATIBLE_CHANGE,
         OptionMetadataTag.TRIGGERED_BY_ALL_INCOMPATIBLE_CHANGES
       },
-      help = "If set to true, function `FileType` is not available."
-  )
+      help = "If set to true, function `FileType` is not available.")
   public boolean incompatibleDisallowFileType;
 
   @Option(
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
index 3a7882a..de054dc 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/SkylarkSemantics.java
@@ -222,7 +222,7 @@
           .incompatibleDisableObjcProviderResources(false)
           .incompatibleDisallowDataTransition(true)
           .incompatibleDisallowDictPlus(false)
-          .incompatibleDisallowFileType(false)
+          .incompatibleDisallowFileType(true)
           .incompatibleDisallowLegacyJavaProvider(false)
           .incompatibleDisallowLegacyJavaInfo(false)
           .incompatibleDisallowLoadLabelsToCrossPackageBoundaries(false)
diff --git a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkFileHelperTest.java b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkFileHelperTest.java
index 304e478..7f474f9 100644
--- a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkFileHelperTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkFileHelperTest.java
@@ -16,8 +16,6 @@
 
 import static com.google.common.truth.Truth.assertThat;
 
-import com.google.devtools.build.lib.actions.Artifact;
-import com.google.devtools.build.lib.actions.util.ActionsTestUtil;
 import com.google.devtools.build.lib.analysis.skylark.SkylarkRuleContext;
 import com.google.devtools.build.lib.skylark.util.SkylarkTestCase;
 import org.junit.Before;
@@ -42,23 +40,6 @@
         "  outs = ['c.txt'])");
   }
 
-  @SuppressWarnings("unchecked")
-  @Test
-  public void testFilterPasses() throws Exception {
-    SkylarkRuleContext ruleContext = createRuleContext("//foo:foo");
-    Object result =
-        evalRuleContextCode(ruleContext, "FileType(['.img']).filter(ruleContext.files.srcs)");
-    assertThat(ActionsTestUtil.baseNamesOf((Iterable<Artifact>) result)).isEqualTo("b.img");
-  }
-
-  @Test
-  public void testFilterFiltersFilesOut() throws Exception {
-    SkylarkRuleContext ruleContext = createRuleContext("//foo:foo");
-    Object result =
-        evalRuleContextCode(ruleContext, "FileType(['.xyz']).filter(ruleContext.files.srcs)");
-    assertThat(((Iterable<?>) result)).isEmpty();
-  }
-
   @Test
   public void testArtifactPath() throws Exception {
     SkylarkRuleContext ruleContext = createRuleContext("//foo:foo");
diff --git a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
index d509ad7..9fe3d20 100644
--- a/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
+++ b/src/test/java/com/google/devtools/build/lib/skylark/SkylarkRuleClassFunctionsTest.java
@@ -25,7 +25,6 @@
 import com.google.devtools.build.lib.analysis.config.transitions.NoTransition;
 import com.google.devtools.build.lib.analysis.skylark.SkylarkAttr;
 import com.google.devtools.build.lib.analysis.skylark.SkylarkAttr.Descriptor;
-import com.google.devtools.build.lib.analysis.skylark.SkylarkFileType;
 import com.google.devtools.build.lib.analysis.skylark.SkylarkRuleClassFunctions.SkylarkRuleFunction;
 import com.google.devtools.build.lib.analysis.skylark.SkylarkRuleContext;
 import com.google.devtools.build.lib.cmdline.Label;
@@ -247,13 +246,6 @@
     assertThat(attr.isSingleArtifact()).isTrue();
   }
 
-  @Test
-  public void testAttrWithSkylarkFileType() throws Exception {
-    Attribute attr = buildAttribute("a1", "attr.label_list(allow_files = FileType(['.xml']))");
-    assertThat(attr.getAllowedFileTypesPredicate().apply("a.xml")).isTrue();
-    assertThat(attr.getAllowedFileTypesPredicate().apply("a.txt")).isFalse();
-  }
-
   private static SkylarkProviderIdentifier legacy(String legacyId) {
     return SkylarkProviderIdentifier.forLegacy(legacyId);
   }
@@ -860,13 +852,6 @@
   }
 
   @Test
-  public void testFileType() throws Exception {
-    Object result = evalRuleClassCode("FileType(['.css'])");
-    SkylarkFileType fts = (SkylarkFileType) result;
-    assertThat(fts.getExtensions()).isEqualTo(ImmutableList.of(".css"));
-  }
-
-  @Test
   public void testFileTypeIsDisabled() throws Exception {
     SkylarkSemantics semantics =
         SkylarkSemantics.DEFAULT_SEMANTICS.toBuilder().incompatibleDisallowFileType(true).build();