Support building all variants.

Bug: 143217452
Test: cd external/rust; mma; atest in all TEST_MAPPING subdirs
Change-Id: I6dae7032877e725edc4567fd6ccf13c26b6c5a73

1 files changed, 3 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 42005cc..b1543e1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -45,6 +45,9 @@
 #![allow(clippy::mem_replace_with_default, clippy::manual_non_exhaustive)]
 #![allow(clippy::needless_doctest_main)]
 
+// ANDROID: Use std to allow building as a dylib.
+extern crate std;
+
 #[doc(inline)]
 pub use pin_project_internal::pin_project;