remove need for nightly toolchain

Nightly toolchain was previously required since the non-stabilized
feature "let-chains" was used. Although the corresponding code is now a
bit uglier, we do not need Nightly toolchain anymore.

Signed-off-by: Jonas Jelonek <[email protected]>

README.md

@@ -12,10 +12,6 @@ Of course, this all is limited by my current knowledge of Rust. This project is
 
 If you think there is room for improvement, please open an issue or a pull request.
 
-## Disclaimer
-
-**This currently needs Rust nightly compiler since I implemented some things with the help of currently non-stabilized features.**
-
 ## Supported TFTP features
 
 - [x] Server mode
@@ -30,7 +26,7 @@ If you think there is room for improvement, please open an issue or a pull reque
   - [x] Transfer size
   - [ ] Window size
 
-It supports parallel operation with a arbitrary number of peers.
+It supports parallel operation with an arbitrary number of peers.
 
 ## Supported RFCs
 - [x] RFC 1350 - TFTP protocol
@@ -39,7 +35,3 @@ It supports parallel operation with a arbitrary number of peers.
 - [x] RFC 2349 - TFTP timeout and transfer size options
 - [ ] RFC 7440 - TFTP windowsize option
 
-## Big TODOs
-
-- remove need for nightly toolchain
-- improve general output, especially for debugging

src/main.rs

@@ -1,4 +1,3 @@
-#![feature(let_chains)]
 
 pub mod cli;
 pub mod tftp;

src/tftp/mod.rs

@@ -195,9 +195,11 @@ impl TftpConnection {
 
 	pub fn receive_packet<'a>(&self, buf: &'a mut [u8]) -> Result<packet::TftpPacket<'a>> {
 		let recv = self.receive_packet_from(buf)?;
-		if let Ok(peer) = self.socket.peer_addr() && peer != recv.1 { /* IP and port must be the same for whole connection */
-			self.send_error(ErrorCode::UnknownTid, "").ok();
-			return Err(ConnectionError::UnknownTid);
+		if let Ok(peer) = self.socket.peer_addr() {
+			if peer != recv.1 { /* IP and port must be the same for whole connection */
+				self.send_error(ErrorCode::UnknownTid, "").ok();
+				return Err(ConnectionError::UnknownTid);
+			}
 		}
 
 		Ok(recv.0)