"async-await" feature

Author: taiki-e

futures-util/Cargo.toml

@@ -28,7 +28,7 @@ sink = ["futures-sink-preview"]
 io = ["std", "futures-io-preview", "memchr"]
 channel = ["std", "futures-channel-preview"]
 select-macro = ["async-await", "futures-select-macro-preview", "proc-macro-hack", "proc-macro-nested", "rand"]
-async-stream = ["std"]
+async-stream = ["std", "async-await"]
 
 [dependencies]
 futures-core-preview = { path = "../futures-core", version = "=0.3.0-alpha.17", default-features = false }

futures/Cargo.toml

@@ -46,7 +46,7 @@ compat = ["std", "futures-util-preview/compat"]
 io-compat = ["compat", "futures-util-preview/io-compat"]
 cfg-target-has-atomic = ["futures-core-preview/cfg-target-has-atomic", "futures-util-preview/cfg-target-has-atomic"]
 alloc = ["futures-core-preview/alloc", "futures-sink-preview/alloc", "futures-util-preview/alloc"]
-async-stream = ["std", "futures-util-preview/async-stream", "futures-async-macro-preview"]
+async-stream = ["std", "async-await", "futures-util-preview/async-stream", "futures-async-macro-preview"]
 
 [package.metadata.docs.rs]
 all-features = true