diff --git a/stdlib/public/core/LifetimeManager.swift b/stdlib/public/core/LifetimeManager.swift
index eeaeba32b2484..c8c555efb926e 100644
--- a/stdlib/public/core/LifetimeManager.swift
+++ b/stdlib/public/core/LifetimeManager.swift
@@ -290,7 +290,7 @@ public func _copy<T>(_ value: T) -> T {
 @_alwaysEmitIntoClient
 @_transparent
 @lifetime(borrow source)
-internal func _overrideLifetime<
+public func _overrideLifetime<
   T: ~Copyable & ~Escapable, U: ~Copyable & ~Escapable
 >(
   _ dependent: consuming T, borrowing source: borrowing U
@@ -308,7 +308,7 @@ internal func _overrideLifetime<
 @_alwaysEmitIntoClient
 @_transparent
 @lifetime(copy source)
-internal func _overrideLifetime<
+public func _overrideLifetime<
   T: ~Copyable & ~Escapable, U: ~Copyable & ~Escapable
 >(
   _ dependent: consuming T, copying source: borrowing U
@@ -326,7 +326,7 @@ internal func _overrideLifetime<
 @_alwaysEmitIntoClient
 @_transparent
 @lifetime(&source)
-internal func _overrideLifetime<
+public func _overrideLifetime<
   T: ~Copyable & ~Escapable, U: ~Copyable & ~Escapable
 >(
   _ dependent: consuming T,
diff --git a/test/SILOptimizer/Inputs/SpanExtras.swift b/test/SILOptimizer/Inputs/SpanExtras.swift
index 881ac3d998b26..29ddeb2817d39 100644
--- a/test/SILOptimizer/Inputs/SpanExtras.swift
+++ b/test/SILOptimizer/Inputs/SpanExtras.swift
@@ -1,56 +1,5 @@
 import Builtin
 
-/// Unsafely discard any lifetime dependency on the `dependent` argument. Return
-/// a value identical to `dependent` with a lifetime dependency on the caller's
-/// borrow scope of the `source` argument.
-@unsafe
-@_unsafeNonescapableResult
-@_alwaysEmitIntoClient
-@_transparent
-@lifetime(borrow source)
-internal func _overrideLifetime<
-  T: ~Copyable & ~Escapable, U: ~Copyable & ~Escapable
->(
-  _ dependent: consuming T, borrowing source: borrowing U
-) -> T {
-  // TODO: Remove @_unsafeNonescapableResult. Instead, the unsafe dependence
-  // should be expressed by a builtin that is hidden within the function body.
-  dependent
-}
-
-/// Unsafely discard any lifetime dependency on the `dependent` argument. Return
-/// a value identical to `dependent` that inherits all lifetime dependencies from
-/// the `source` argument.
-@unsafe
-@_unsafeNonescapableResult
-@_alwaysEmitIntoClient
-@_transparent
-@lifetime(copy source)
-internal func _overrideLifetime<
-  T: ~Copyable & ~Escapable, U: ~Copyable & ~Escapable
->(
-  _ dependent: consuming T, copying source: borrowing U
-) -> T {
-  // TODO: Remove @_unsafeNonescapableResult. Instead, the unsafe dependence
-  // should be expressed by a builtin that is hidden within the function body.
-  dependent
-}
-
-@unsafe
-@_unsafeNonescapableResult
-@_alwaysEmitIntoClient
-@_transparent
-@lifetime(&source)
-internal func _overrideLifetime<
-  T: ~Copyable & ~Escapable, U: ~Copyable & ~Escapable
->(
-  _ dependent: consuming T, mutating source: inout U
-) -> T {
-  // TODO: Remove @_unsafeNonescapableResult. Instead, the unsafe dependence
-  // should be expressed by a builtin that is hidden within the function body.
-  dependent
-}
-
 // A MutableSpan<Element> represents a span of memory which
 // contains initialized `Element` instances.
 @frozen