[Frontend/NFC] SE-0400: Enable InitAccessors feature by default

(cherry picked from commit 2a0651e)

Author: xedin

include/swift/Basic/Features.def

@@ -122,7 +122,6 @@ EXPERIMENTAL_FEATURE(NamedOpaqueTypes, false)
 EXPERIMENTAL_FEATURE(FlowSensitiveConcurrencyCaptures, false)
 EXPERIMENTAL_FEATURE(CodeItemMacros, false)
 EXPERIMENTAL_FEATURE(TupleConformances, false)
-EXPERIMENTAL_FEATURE(InitAccessors, false)
 
 SUPPRESSIBLE_LANGUAGE_FEATURE(ExtensionMacroAttr, 0, "@attached(extension)", true)
 

lib/AST/ASTPrinter.cpp

@@ -3243,10 +3243,6 @@ static bool usesFeatureTupleConformances(Decl *decl) {
   return false;
 }
 
-static bool usesFeatureInitAccessors(Decl *decl) {
-  return false;
-}
-
 static bool usesFeatureLayoutPrespecialization(Decl *decl) {
   auto &attrs = decl->getAttrs();
   return std::any_of(attrs.begin(), attrs.end(), [](auto *attr) {

lib/Parse/ParseDecl.cpp

@@ -7140,9 +7140,7 @@ static bool parseAccessorIntroducer(Parser &P,
     }
   }
 
-  bool isInitAccessor = (P.Context.LangOpts.hasFeature(Feature::InitAccessors)
-                         && P.Tok.is(tok::kw_init));
-  if (!(P.Tok.is(tok::identifier) || isInitAccessor) ||
+  if (!(P.Tok.is(tok::identifier) || P.Tok.is(tok::kw_init)) ||
       P.Tok.isEscapedIdentifier()) {
     return true;
   }

test/Interpreter/init_accessors.swift

@@ -1,8 +1,7 @@
-// RUN: %target-run-simple-swift(-Xfrontend -enable-experimental-feature -Xfrontend InitAccessors) | %FileCheck %s
-// RUN: %target-run-simple-swift(-O -Xfrontend -enable-experimental-feature -Xfrontend InitAccessors) | %FileCheck %s
+// RUN: %target-run-simple-swift | %FileCheck %s
+// RUN: %target-run-simple-swift(-O) | %FileCheck %s
 
 // REQUIRES: executable_test
-// REQUIRES: asserts
 
 struct TestInit {
   var x: Int

test/ModuleInterface/Observable.swift

@@ -1,11 +1,8 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-emit-module-interface(%t/Library.swiftinterface) %s -module-name Library -plugin-path %swift-host-lib-dir/plugins -disable-availability-checking -enable-experimental-feature InitAccessors
+// RUN: %target-swift-emit-module-interface(%t/Library.swiftinterface) %s -module-name Library -plugin-path %swift-host-lib-dir/plugins -disable-availability-checking
 // RUN: %target-swift-typecheck-module-from-interface(%t/Library.swiftinterface) -module-name Library -disable-availability-checking
 // RUN: %FileCheck %s < %t/Library.swiftinterface
 
-// Asserts is required for '-enable-experimental-feature InitAccessors'.
-// REQUIRES: asserts
-
 // REQUIRES: swift_swift_parser
 // REQUIRES: observation
 

test/SILOptimizer/init_accessor_definite_init_diagnostics.swift

@@ -1,6 +1,4 @@
-// RUN: %target-swift-frontend -enable-experimental-feature InitAccessors -enable-copy-propagation=requested-passes-only -emit-sil -primary-file %s -o /dev/null -verify
-
-// REQUIRES: asserts
+// RUN: %target-swift-frontend -enable-copy-propagation=requested-passes-only -emit-sil -primary-file %s -o /dev/null -verify
 
 struct Test1 {
   var x: Int // expected-note {{variable defined here}}

test/SILOptimizer/init_accessor_raw_sil_lowering.swift

@@ -1,6 +1,4 @@
-// RUN: %target-swift-frontend -enable-experimental-feature InitAccessors -Xllvm -sil-print-after=definite-init -emit-sil -module-name assign_or_init_lowering %s -o /dev/null 2>&1 | %FileCheck %s
-
-// REQUIRES: asserts
+// RUN: %target-swift-frontend -Xllvm -sil-print-after=definite-init -emit-sil -module-name assign_or_init_lowering %s -o /dev/null 2>&1 | %FileCheck %s
 
 protocol Storage<T> {
   associatedtype T

test/SILOptimizer/init_accessors.swift

@@ -1,9 +1,7 @@
-// RUN: %target-swift-frontend -enable-experimental-feature InitAccessors -primary-file %s -Onone -emit-sil \
+// RUN: %target-swift-frontend -primary-file %s -Onone -emit-sil \
 // RUN:   -Xllvm -sil-print-after=raw-sil-inst-lowering \
 // RUN:   -o /dev/null -module-name init_accessors 2>&1 | %FileCheck %s
 
-// REQUIRES: asserts
-
 class NSObject {}
 
 struct TestInit {

test/Serialization/init_accessors.swift

@@ -3,15 +3,11 @@
 // RUN: %empty-directory(%t/sdk)
 // RUN: split-file %s %t/src
 
-// REQUIRES: asserts
-
 // RUN: %target-swift-frontend -emit-module %t/src/PublicModule.swift \
 // RUN:   -module-name PublicModule -swift-version 5 \
-// RUN:   -emit-module-path %t/sdk/PublicModule.swiftmodule \
-// RUN:   -enable-experimental-feature InitAccessors
+// RUN:   -emit-module-path %t/sdk/PublicModule.swiftmodule
 
 // RUN: %target-swift-frontend -typecheck %t/src/Client.swift \
-// RUN:   -enable-experimental-feature InitAccessors \
 // RUN:   -module-name Client -I %t/sdk
 
 //--- PublicModule.swift

test/decl/var/init_accessors.swift

@@ -1,6 +1,4 @@
-// RUN: %target-typecheck-verify-swift -enable-experimental-feature InitAccessors
-
-// REQUIRES: asserts
+// RUN: %target-typecheck-verify-swift
 
 func test_empty_init_accessor() {
   struct Test {