Remove references to experimental feature.

Closes #11750

RELNOTES: None.
PiperOrigin-RevId: 338309283
diff --git a/site/docs/skylark/config.md b/site/docs/skylark/config.md
index 9771feb..30ecbac 100644
--- a/site/docs/skylark/config.md
+++ b/site/docs/skylark/config.md
@@ -262,9 +262,6 @@
 on the command line. Aliases function similarly to native flags and also make use
 of the double-dash option syntax.
 
-Note: This feature is currently experimental. To enable it, set
-`--experimental_enable_flag_alias` to true.
-
 Set an alias by adding `--flag_alias=ALIAS_NAME=TARGET_PATH`
 to your `.bazelrc` . For example, to set an alias to `coffee`:
 
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java b/src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java
index 8e292e3..c016d6c 100644
--- a/src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java
@@ -833,17 +833,6 @@
       help = "Whether to enable the use of AggregatingMiddleman in rules.")
   public boolean enableAggregatingMiddleman;
 
-  // TODO(b/132346407): Remove when all usages are gone.
-  @Option(
-      name = "experimental_enable_flag_alias",
-      defaultValue = "true",
-      documentationCategory = OptionDocumentationCategory.INPUT_STRICTNESS,
-      effectTags = {OptionEffectTag.CHANGES_INPUTS},
-      metadataTags = {OptionMetadataTag.EXPERIMENTAL},
-      help = "When enabled, alternate names can be assigned to Starlark-defined flags.")
-  public boolean enableFlagAlias;
-
-  // TODO(b/132346407): Update docs when the feature is fully implemented
   @Option(
       name = "flag_alias",
       converter = Converters.FlagAliasConverter.class,
@@ -853,8 +842,7 @@
       effectTags = {OptionEffectTag.CHANGES_INPUTS},
       help =
           "Sets a shorthand name for a Starlark flag. It takes a single key-value pair in the form"
-              + " \"<key>=<value>\" as an argument. This is an experimental feature and will be"
-              + " ignored unless --experimental_enable_flag_alias is set to true.")
+              + " \"<key>=<value>\" as an argument.")
   public List<Map.Entry<String, String>> commandLineFlagAliases;
 
   @Option(
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BlazeOptionHandler.java b/src/main/java/com/google/devtools/build/lib/runtime/BlazeOptionHandler.java
index 6f56907..9d144ca 100644
--- a/src/main/java/com/google/devtools/build/lib/runtime/BlazeOptionHandler.java
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BlazeOptionHandler.java
@@ -20,7 +20,6 @@
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.ListMultimap;
 import com.google.common.flogger.GoogleLogger;
-import com.google.devtools.build.lib.analysis.config.CoreOptions;
 import com.google.devtools.build.lib.events.Event;
 import com.google.devtools.build.lib.events.EventHandler;
 import com.google.devtools.build.lib.events.ExtendedEventHandler;
@@ -42,7 +41,6 @@
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
-import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
 import java.util.function.Function;
@@ -243,9 +241,6 @@
     optionsParser.parseWithSourceFunction(
         PriorityCategory.COMMAND_LINE, commandOptionSourceFunction, remainingCmdLine.build());
 
-    // TODO(b/132346407) : Remove when shorthand aliasing is fully implemented
-    validateFlagAliasUsage(optionsParser);
-
     if (commandAnnotation.builds()) {
       // splits project files from targets in the traditional sense
       ProjectFileSupport.handleProjectFiles(
@@ -521,41 +516,4 @@
       }
     }
   }
-
-  private static void validateFlagAliasUsage(OptionsParser optionsParser)
-      throws OptionsParsingException {
-
-    CoreOptions coreOptions = optionsParser.getOptions(CoreOptions.class);
-
-    // --flag_alias would've thrown an error before reaching this if it was used, but CoreOptions
-    // may not necessarily be present
-    if (coreOptions == null) {
-      return;
-    }
-
-    List<Map.Entry<String, String>> collectedAliases = coreOptions.commandLineFlagAliases;
-    if (collectedAliases.isEmpty()) {
-      return;
-    }
-
-    if (coreOptions.enableFlagAlias) {
-      return;
-    }
-
-    String detectedAliases =
-        "Detected aliases: --flag_alias="
-            + collectedAliases.get(0).getKey()
-            + "="
-            + collectedAliases.get(0).getValue();
-    for (int i = 1; i < collectedAliases.size(); i++) {
-      Map.Entry<String, String> entry = collectedAliases.get(i);
-      String aliasString = ", --flag_alias=" + entry.getKey() + "=" + entry.getValue();
-      detectedAliases += aliasString;
-    }
-
-    throw new OptionsParsingException(
-        "--flag_alias is experimental. Set --experimental_enable_flag_alias to true to make use of"
-            + " it. "
-            + detectedAliases);
-  }
 }
diff --git a/src/test/java/com/google/devtools/build/lib/runtime/FlagAliasTest.java b/src/test/java/com/google/devtools/build/lib/runtime/FlagAliasTest.java
index b59262b..11f024c 100644
--- a/src/test/java/com/google/devtools/build/lib/runtime/FlagAliasTest.java
+++ b/src/test/java/com/google/devtools/build/lib/runtime/FlagAliasTest.java
@@ -55,75 +55,9 @@
   }
 
   @Test
-  public void useAliasWithSetDisabledFeature() {
-    ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--noexperimental_enable_flag_alias",
-            "--flag_alias=foo=//bar");
-    optionHandler.parseOptions(args, eventHandler);
-    assertThat(eventHandler.getEvents())
-        .contains(
-            Event.error(
-                "--flag_alias is experimental. Set --experimental_enable_flag_alias to true to"
-                    + " make use of it. Detected aliases: --flag_alias=foo=//bar"));
-  }
-
-  @Test
-  public void useAliasWithSetDisabledFeatureRcFile() {
-    ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--default_override=0:c0=--noexperimental_enable_flag_alias",
-            "--rc_source=/somewhere/.blazerc",
-            "--flag_alias=foo=//bar");
-    optionHandler.parseOptions(args, eventHandler);
-    assertThat(eventHandler.getEvents())
-        .contains(
-            Event.error(
-                "--flag_alias is experimental. Set --experimental_enable_flag_alias to true to"
-                    + " make use of it. Detected aliases: --flag_alias=foo=//bar"));
-  }
-
-  @Test
-  public void useAliasWithSetEnabledFeature() {
-    ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=foo=//bar");
-    optionHandler.parseOptions(args, eventHandler);
-    assertThat(eventHandler.hasErrors()).isFalse();
-  }
-
-  @Test
-  public void multipleAliasesLoggedInError() {
-    ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--noexperimental_enable_flag_alias",
-            "--flag_alias=foo=//bar",
-            "--flag_alias=baz=//baz2");
-    optionHandler.parseOptions(args, eventHandler);
-    assertThat(eventHandler.getEvents())
-        .contains(
-            Event.error(
-                "--flag_alias is experimental. Set --experimental_enable_flag_alias to true to"
-                    + " make use of it. Detected aliases: --flag_alias=foo=//bar,"
-                    + " --flag_alias=baz=//baz2"));
-  }
-
-  @Test
   public void useAliasWithNonStarlarkFlag() {
     ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=foo=bar");
+        ImmutableList.of("c0", "--rc_source=/somewhere/.blazerc", "--flag_alias=foo=bar");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.getEvents())
         .contains(
@@ -135,11 +69,7 @@
   @Test
   public void useAliasWithValueAssignment() {
     ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=foo=//bar=7");
+        ImmutableList.of("c0", "--rc_source=/somewhere/.blazerc", "--flag_alias=foo=//bar=7");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.getEvents())
         .contains(
@@ -151,11 +81,7 @@
   @Test
   public void useAliasWithInvalidName() {
     ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=bad$foo=//bar");
+        ImmutableList.of("c0", "--rc_source=/somewhere/.blazerc", "--flag_alias=bad$foo=//bar");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.getEvents())
         .contains(
@@ -167,11 +93,7 @@
   @Test
   public void useAliasWithoutEqualsInValue() {
     ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=foo");
+        ImmutableList.of("c0", "--rc_source=/somewhere/.blazerc", "--flag_alias=foo");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.getEvents())
         .contains(
@@ -183,12 +105,7 @@
   @Test
   public void useAliasWithoutEqualsInArg() {
     ImmutableList<String> args =
-        ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias",
-            "foo=//bar");
+        ImmutableList.of("c0", "--rc_source=/somewhere/.blazerc", "--flag_alias", "foo=//bar");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.hasErrors()).isFalse();
   }
@@ -197,11 +114,7 @@
   public void useAliasWithBooleanSyntax() {
     ImmutableList<String> args =
         ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=foo=//bar",
-            "--foo");
+            "c0", "--rc_source=/somewhere/.blazerc", "--flag_alias=foo=//bar", "--foo");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(parser.getResidue()).contains("--//bar");
   }
@@ -212,7 +125,6 @@
         ImmutableList.of(
             "c0",
             "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
             "--flag_alias=foo=//bar",
             "--nofoo");
     optionHandler.parseOptions(args, eventHandler);
@@ -226,7 +138,6 @@
         ImmutableList.of(
             "c0",
             "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
             "--flag_alias=foo=//bar",
             "--foo",
             "--flag_alias=foo=//baz",
@@ -241,7 +152,6 @@
     ImmutableList<String> args =
         ImmutableList.of(
             "c0",
-            "--default_override=0:c0=--experimental_enable_flag_alias",
             "--default_override=0:c0=--flag_alias=foo=//bar",
             "--default_override=0:c0=--foo",
             "--rc_source=/somewhere/.blazerc");
@@ -255,7 +165,6 @@
     ImmutableList<String> args =
         ImmutableList.of(
             "c0",
-            "--default_override=0:c0=--experimental_enable_flag_alias",
             "--default_override=0:c0=--flag_alias=foo=//bar",
             "--rc_source=/somewhere/.blazerc",
             "--foo");
@@ -268,11 +177,7 @@
   public void setAliasOnCommandLine_useOnCommandLine() {
     ImmutableList<String> args =
         ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--flag_alias=foo=//bar",
-            "--foo=7");
+            "c0", "--rc_source=/somewhere/.blazerc", "--flag_alias=foo=//bar", "--foo=7");
     ImmutableList<String> expectedResidue = ImmutableList.of("--//bar=7");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(parser.getResidue()).isEqualTo(expectedResidue);
@@ -285,7 +190,6 @@
             "c0",
             "--default_override=0:c0=--foo=7",
             "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
             "--flag_alias=foo=//bar");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.getEvents())
@@ -296,11 +200,7 @@
   public void useAliasBeforeSettingOnCommandLine() {
     ImmutableList<String> args =
         ImmutableList.of(
-            "c0",
-            "--rc_source=/somewhere/.blazerc",
-            "--experimental_enable_flag_alias",
-            "--foo=7",
-            "--flag_alias=foo=//bar");
+            "c0", "--rc_source=/somewhere/.blazerc", "--foo=7", "--flag_alias=foo=//bar");
     optionHandler.parseOptions(args, eventHandler);
     assertThat(eventHandler.getEvents())
         .contains(Event.error("--foo=7 :: Unrecognized option: --foo=7").withTag(BAD_OPTION_TAG));