More robust file implementation

Signed-off-by: Yoshua Wuyts <yoshuawuyts@gmail.com>

Author: Stjepan Glavina

Cargo.toml

@@ -27,10 +27,9 @@ unstable = []
 async-task = "1.0.0"
 cfg-if = "0.1.9"
 crossbeam-channel = "0.3.9"
-futures-channel-preview = "0.3.0-alpha.18"
 futures-core-preview = "0.3.0-alpha.18"
 futures-io-preview = "0.3.0-alpha.18"
-futures-timer = "0.3.0"
+futures-timer = "0.4.0"
 lazy_static = "1.3.0"
 log = { version = "0.4.8", features = ["kv_unstable"] }
 memchr = "2.2.1"

examples/print-file.rs

@@ -7,7 +7,7 @@ use async_std::io;
 use async_std::prelude::*;
 use async_std::task;
 
-const LEN: usize = 4 * 1024 * 1024; // 4 Mb
+const LEN: usize = 16 * 1024; // 16 Kb
 
 fn main() -> io::Result<()> {
     let path = args().nth(1).expect("missing path argument");