From 0fa63a198069c01e1b97a0201a131c91cdabb61a Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sat, 1 May 2021 14:28:38 -0700
Subject: [PATCH] Add regression test of issue 857

This currently fails to compile.

    error: `extern` block uses type `String`, which is not FFI-safe
       --> tests/ffi/lib.rs:329:34
        |
    329 |     impl CxxVector<SharedString> {}
        |                                  ^^ not FFI-safe
        |
    note: the lint level is defined here
       --> tests/ffi/lib.rs:23:1
        |
    23  | #[cxx::bridge(namespace = "tests")]
        | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
        = note: this struct has unspecified layout
        = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
---
 tests/ffi/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/ffi/lib.rs b/tests/ffi/lib.rs
index eb889e05..25b4ccdc 100644
--- a/tests/ffi/lib.rs
+++ b/tests/ffi/lib.rs
@@ -326,6 +326,7 @@ pub mod ffi {
     }
 
     impl Box<Shared> {}
+    impl CxxVector<SharedString> {}
 }
 
 mod other {