Vendor dependencies for 0.3.0 release

vendor/futures-core/src/lib.rs

@@ -0,0 +1,27 @@
+//! Core traits and types for asynchronous operations in Rust.
+
+#![no_std]
+#![doc(test(
+    no_crate_inject,
+    attr(
+        deny(warnings, rust_2018_idioms, single_use_lifetimes),
+        allow(dead_code, unused_assignments, unused_variables)
+    )
+))]
+#![warn(missing_docs, /* unsafe_op_in_unsafe_fn */)] // unsafe_op_in_unsafe_fn requires Rust 1.52
+
+#[cfg(feature = "alloc")]
+extern crate alloc;
+#[cfg(feature = "std")]
+extern crate std;
+
+pub mod future;
+#[doc(no_inline)]
+pub use self::future::{FusedFuture, Future, TryFuture};
+
+pub mod stream;
+#[doc(no_inline)]
+pub use self::stream::{FusedStream, Stream, TryStream};
+
+#[macro_use]
+pub mod task;