diff --git a/Documentation/Porting.md b/Documentation/Porting.md
index 4773e2823..365551d4c 100644
--- a/Documentation/Porting.md
+++ b/Documentation/Porting.md
@@ -193,7 +193,7 @@ to load that information:
 ```
 
 You will also need to update the `makeTestContentRecordDecl()` function in the
-`TestingMacros` target to emit the correct `@_section` attribute for your
+`TestingMacros` target to emit the correct `@section` attribute for your
 platform. If your platform uses the ELF image format and supports the
 `dl_iterate_phdr()` function, add it to the existing `#elseif os(Linux) || ...`
 case. Otherwise, add a new case for your platform:
@@ -203,7 +203,7 @@ case. Otherwise, add a new case for your platform:
 +++ b/Sources/TestingMacros/Support/TestContentGeneration.swift
    // ...
 +  #elseif os(Classic)
-+  @_section(".rsrc,swft,__swift5_tests")
++  @section(".rsrc,swft,__swift5_tests")
    #else
    @__testing(warning: "Platform-specific implementation missing: test content section name unavailable")
    #endif
@@ -214,6 +214,11 @@ directly into test authors' test targets, so you will not be able to use
 compiler conditionals defined in the Swift Testing package (including those that
 start with `"SWT_"`).
 
+> [!NOTE]
+> We are not using `objectFormat()` yet to maintain compatibility with the Swift
+> 6.2 toolchain. We will migrate to `objectFormat()` when we drop Swift 6.2
+> toolchain support (presumably after Swift 6.3 ships).
+
 ## Runtime test discovery with static linkage
 
 If your platform does not support dynamic linking and loading, you will need to
diff --git a/Package.swift b/Package.swift
index a82241527..19ebefc4c 100644
--- a/Package.swift
+++ b/Package.swift
@@ -385,11 +385,6 @@ extension Array where Element == PackageDescription.SwiftSetting {
 
       .enableUpcomingFeature("MemberImportVisibility"),
 
-      // This setting is enabled in the package, but not in the toolchain build
-      // (via CMake). Enabling it is dependent on acceptance of the @section
-      // proposal via Swift Evolution.
-      .enableExperimentalFeature("SymbolLinkageMarkers"),
-
       .enableUpcomingFeature("InferIsolatedConformances"),
 
       // When building as a package, the macro plugin always builds as an
diff --git a/Sources/TestingMacros/ConditionMacro.swift b/Sources/TestingMacros/ConditionMacro.swift
index 6ba8ff124..a7697c97b 100644
--- a/Sources/TestingMacros/ConditionMacro.swift
+++ b/Sources/TestingMacros/ConditionMacro.swift
@@ -13,10 +13,6 @@ public import SwiftSyntax
 import SwiftSyntaxBuilder
 public import SwiftSyntaxMacros
 
-#if !hasFeature(SymbolLinkageMarkers) && SWT_NO_LEGACY_TEST_DISCOVERY
-#error("Platform-specific misconfiguration: either SymbolLinkageMarkers or legacy test discovery is required to expand #expect(processExitsWith:)")
-#endif
-
 /// A protocol containing the common implementation for the expansions of the
 /// `#expect()` and `#require()` macros.
 ///
@@ -496,7 +492,7 @@ extension ExitTestConditionMacro {
 
       // Create another local type for legacy test discovery.
       var recordDecl: DeclSyntax?
-#if !SWT_NO_LEGACY_TEST_DISCOVERY
+#if compiler(<6.3)
       let legacyEnumName = context.makeUniqueName("__🟡$")
       recordDecl = """
       enum \(legacyEnumName): Testing.__TestContentRecordContainer {
@@ -511,7 +507,7 @@ extension ExitTestConditionMacro {
         """
         @available(*, deprecated, message: "This type is an implementation detail of the testing library. Do not use it directly.")
         enum \(enumName) {
-          private nonisolated static let accessor: Testing.__TestContentRecordAccessor = { outValue, type, hint, _ in
+          @c private nonisolated static func accessor(_ outValue: UnsafeMutableRawPointer, _ type: UnsafeRawPointer, _ hint: UnsafeRawPointer?, _: UInt) -> CBool {
             Testing.ExitTest.__store(
               \(idExpr),
               \(bodyThunkName),
diff --git a/Sources/TestingMacros/SuiteDeclarationMacro.swift b/Sources/TestingMacros/SuiteDeclarationMacro.swift
index 4bee4c30f..73eb09a76 100644
--- a/Sources/TestingMacros/SuiteDeclarationMacro.swift
+++ b/Sources/TestingMacros/SuiteDeclarationMacro.swift
@@ -13,10 +13,6 @@ public import SwiftSyntax
 import SwiftSyntaxBuilder
 public import SwiftSyntaxMacros
 
-#if !hasFeature(SymbolLinkageMarkers) && SWT_NO_LEGACY_TEST_DISCOVERY
-#error("Platform-specific misconfiguration: either SymbolLinkageMarkers or legacy test discovery is required to expand @Suite")
-#endif
-
 /// A type describing the expansion of the `@Suite` attribute macro.
 ///
 /// This type is used to implement the `@Suite` attribute macro. Do not use it
@@ -149,7 +145,7 @@ public struct SuiteDeclarationMacro: MemberMacro, PeerMacro, Sendable {
     result.append(
       """
       @available(*, deprecated, message: "This property is an implementation detail of the testing library. Do not use it directly.")
-      private nonisolated static let \(accessorName): Testing.__TestContentRecordAccessor = { outValue, type, _, _ in
+      @c private nonisolated static func \(accessorName)(_ outValue: UnsafeMutableRawPointer, _ type: UnsafeRawPointer, _ hint: UnsafeRawPointer?, _: UInt) -> CBool {
         Testing.Test.__store(\(generatorName), into: outValue, asTypeAt: type)
       }
       """
@@ -166,7 +162,7 @@ public struct SuiteDeclarationMacro: MemberMacro, PeerMacro, Sendable {
       )
     )
 
-#if !SWT_NO_LEGACY_TEST_DISCOVERY
+#if compiler(<6.3)
     // Emit a type that contains a reference to the test content record.
     let enumName = context.makeUniqueName("__🟡$")
     result.append(
diff --git a/Sources/TestingMacros/Support/TestContentGeneration.swift b/Sources/TestingMacros/Support/TestContentGeneration.swift
index 05214d1b8..314802005 100644
--- a/Sources/TestingMacros/Support/TestContentGeneration.swift
+++ b/Sources/TestingMacros/Support/TestContentGeneration.swift
@@ -74,20 +74,18 @@ func makeTestContentRecordDecl(named name: TokenSyntax, in typeName: TypeSyntax?
   )
   """
 
-#if hasFeature(SymbolLinkageMarkers)
+#if compiler(>=6.3)
   result = """
-  #if hasFeature(SymbolLinkageMarkers)
   #if os(macOS) || os(iOS) || os(watchOS) || os(tvOS) || os(visionOS)
-  @_section("__DATA_CONST,__swift5_tests")
+  @section("__DATA_CONST,__swift5_tests")
   #elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
-  @_section("swift5_tests")
+  @section("swift5_tests")
   #elseif os(Windows)
-  @_section(".sw5test$B")
+  @section(".sw5test$B")
   #else
   @Testing.__testing(warning: "Platform-specific implementation missing: test content section name unavailable")
   #endif
-  @_used
-  #endif
+  @used
   \(result)
   """
 #endif
diff --git a/Sources/TestingMacros/TestDeclarationMacro.swift b/Sources/TestingMacros/TestDeclarationMacro.swift
index 8007c3aaf..435f74b02 100644
--- a/Sources/TestingMacros/TestDeclarationMacro.swift
+++ b/Sources/TestingMacros/TestDeclarationMacro.swift
@@ -13,10 +13,6 @@ public import SwiftSyntax
 import SwiftSyntaxBuilder
 public import SwiftSyntaxMacros
 
-#if !hasFeature(SymbolLinkageMarkers) && SWT_NO_LEGACY_TEST_DISCOVERY
-#error("Platform-specific misconfiguration: either SymbolLinkageMarkers or legacy test discovery is required to expand @Test")
-#endif
-
 /// A type describing the expansion of the `@Test` attribute macro.
 ///
 /// This type is used to implement the `@Test` attribute macro. Do not use it
@@ -476,7 +472,7 @@ public struct TestDeclarationMacro: PeerMacro, Sendable {
     result.append(
       """
       @available(*, deprecated, message: "This property is an implementation detail of the testing library. Do not use it directly.")
-      private \(staticKeyword(for: typeName)) nonisolated let \(accessorName): Testing.__TestContentRecordAccessor = { outValue, type, _, _ in
+      @c private nonisolated \(staticKeyword(for: typeName)) func \(accessorName)(_ outValue: UnsafeMutableRawPointer, _ type: UnsafeRawPointer, _: UnsafeRawPointer?, _: UInt) -> CBool {
         Testing.Test.__store(\(generatorName), into: outValue, asTypeAt: type)
       }
       """
@@ -493,7 +489,7 @@ public struct TestDeclarationMacro: PeerMacro, Sendable {
       )
     )
 
-#if !SWT_NO_LEGACY_TEST_DISCOVERY
+#if compiler(<6.3)
     // Emit a type that contains a reference to the test content record.
     let enumName = context.makeUniqueName(thunking: functionDecl, withPrefix: "__🟡$")
     result.append(
diff --git a/Sources/_TestDiscovery/TestContentRecord.swift b/Sources/_TestDiscovery/TestContentRecord.swift
index b830026e2..1f1bd9c15 100644
--- a/Sources/_TestDiscovery/TestContentRecord.swift
+++ b/Sources/_TestDiscovery/TestContentRecord.swift
@@ -244,7 +244,7 @@ extension DiscoverableAsTestContent {
     return SectionBounds.all(.testContent).lazy.flatMap { sb in
       sb.buffer.withMemoryRebound(to: _TestContentRecord.self) { records in
         (0 ..< records.count).lazy
-          .map { (records.baseAddress! + $0) as UnsafePointer<_TestContentRecord> }
+          .map { records.baseAddress! + $0 }
           .filter { $0.pointee.kind == kind }
           .map { TestContentRecord<Self>(imageAddress: sb.imageAddress, recordAddress: $0) }
       }
diff --git a/Tests/TestingMacrosTests/TestDeclarationMacroTests.swift b/Tests/TestingMacrosTests/TestDeclarationMacroTests.swift
index aec6d2c10..c78fac75d 100644
--- a/Tests/TestingMacrosTests/TestDeclarationMacroTests.swift
+++ b/Tests/TestingMacrosTests/TestDeclarationMacroTests.swift
@@ -472,10 +472,11 @@ struct TestDeclarationMacroTests {
   func differentFunctionTypes(input: String, expectedTypeName: String?, otherCode: String?) throws {
     let (output, _) = try parse(input)
 
-#if hasFeature(SymbolLinkageMarkers)
-    #expect(output.contains("@_section"))
-#endif
-#if !SWT_NO_LEGACY_TEST_DISCOVERY
+#if compiler(>=6.3)
+    #expect(output.contains("@section"))
+    #expect(!output.contains("__TestContentRecordContainer"))
+#else
+    #expect(!output.contains("@section"))
     #expect(output.contains("__TestContentRecordContainer"))
 #endif
     if let expectedTypeName {
diff --git a/Tests/TestingTests/DiscoveryTests.swift b/Tests/TestingTests/DiscoveryTests.swift
index 24d2eecfa..2c415e001 100644
--- a/Tests/TestingTests/DiscoveryTests.swift
+++ b/Tests/TestingTests/DiscoveryTests.swift
@@ -58,7 +58,7 @@ struct DiscoveryTests {
   }
 #endif
 
-#if !SWT_NO_DYNAMIC_LINKING && hasFeature(SymbolLinkageMarkers)
+#if compiler(>=6.3) && !SWT_NO_DYNAMIC_LINKING
   struct MyTestContent: DiscoverableAsTestContent {
     typealias TestContentAccessorHint = UInt32
 
@@ -81,15 +81,15 @@ struct DiscoveryTests {
     }
 
 #if os(macOS) || os(iOS) || os(watchOS) || os(tvOS) || os(visionOS)
-    @_section("__DATA_CONST,__swift5_tests")
+    @section("__DATA_CONST,__swift5_tests")
 #elseif os(Linux) || os(FreeBSD) || os(OpenBSD) || os(Android) || os(WASI)
-    @_section("swift5_tests")
+    @section("swift5_tests")
 #elseif os(Windows)
-    @_section(".sw5test$B")
+    @section(".sw5test$B")
 #else
     @__testing(warning: "Platform-specific implementation missing: test content section name unavailable")
 #endif
-    @_used
+    @used
     private static let record: __TestContentRecord = (
       0xABCD1234,
       0,
@@ -143,21 +143,4 @@ struct DiscoveryTests {
     })
   }
 #endif
-
-#if !SWT_NO_LEGACY_TEST_DISCOVERY && hasFeature(SymbolLinkageMarkers)
-  @Test("Legacy test discovery finds the same number of tests") func discoveredTestCount() async {
-    let oldFlag = Environment.variable(named: "SWT_USE_LEGACY_TEST_DISCOVERY")
-    defer {
-      Environment.setVariable(oldFlag, named: "SWT_USE_LEGACY_TEST_DISCOVERY")
-    }
-
-    Environment.setVariable("1", named: "SWT_USE_LEGACY_TEST_DISCOVERY")
-    let testsWithOldCode = await Array(Test.all).count
-
-    Environment.setVariable("0", named: "SWT_USE_LEGACY_TEST_DISCOVERY")
-    let testsWithNewCode = await Array(Test.all).count
-
-    #expect(testsWithOldCode == testsWithNewCode)
-  }
-#endif
 }