From ff3d4f672bf4e6f66f639fb33d79544a198d6a14 Mon Sep 17 00:00:00 2001
From: Jordan Rose <jordan_rose@apple.com>
Date: Mon, 20 Aug 2018 18:16:22 -0700
Subject: [PATCH] [stdlib] Mark two types @usableFromInline; they satisfy
 requirements

Otherwise, the textual interface won't see them, and any inlinable
code that wants to make use of the protocol might get confused.
We should have a check for this in the compiler itself, but for now
I'm just providing this change to get unblocked.
---
 stdlib/public/core/UnmanagedOpaqueString.swift | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/stdlib/public/core/UnmanagedOpaqueString.swift b/stdlib/public/core/UnmanagedOpaqueString.swift
index 51f4e03b3cd97..1143abf384c62 100644
--- a/stdlib/public/core/UnmanagedOpaqueString.swift
+++ b/stdlib/public/core/UnmanagedOpaqueString.swift
@@ -223,8 +223,8 @@ extension _UnmanagedOpaqueString : RandomAccessCollection {
 }
 
 extension _UnmanagedOpaqueString : _StringVariant {
-  internal typealias Encoding = Unicode.UTF16
-  internal typealias CodeUnit = Encoding.CodeUnit
+  @usableFromInline internal typealias Encoding = Unicode.UTF16
+  @usableFromInline internal typealias CodeUnit = Encoding.CodeUnit
 
   @inlinable
   var isASCII: Bool {