Rollup merge of rust-lang#73962 - ryr3:unsafe_tcp, r=LukasKalbertodt

Manishearth · web-flow · commit ca5b64d2d28d · 2020-07-06T17:45:24.000-07:00
libstd/net/tcp.rs: #![deny(unsafe_op_in_unsafe_fn)] Enclose unsafe operations in unsafe blocks for net/tcp.rs. Fixes part of rust-lang#73904.
diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
@@ -1,3 +1,4 @@
+#![deny(unsafe_op_in_unsafe_fn)]
 use crate::io::prelude::*;
 
 use crate::fmt;
@@ -583,7 +584,8 @@ impl Read for TcpStream {
 
     #[inline]
     unsafe fn initializer(&self) -> Initializer {
-        Initializer::nop()
+        // SAFETY: Read is guaranteed to work on uninitialized memory
+        unsafe { Initializer::nop() }
     }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
@@ -622,7 +624,8 @@ impl Read for &TcpStream {
 
     #[inline]
     unsafe fn initializer(&self) -> Initializer {
-        Initializer::nop()
+        // SAFETY: Read is guaranteed to work on uninitialized memory
+        unsafe { Initializer::nop() }
     }
 }
 #[stable(feature = "rust1", since = "1.0.0")]

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+#![deny(unsafe_op_in_unsafe_fn)]`
`1`	`2`	`use crate::io::prelude::*;`
`2`	`3`
`3`	`4`	`use crate::fmt;`
`@@ -583,7 +584,8 @@ impl Read for TcpStream {`
`583`	`584`
`584`	`585`	`#[inline]`
`585`	`586`	`unsafe fn initializer(&self) -> Initializer {`
`586`		`- Initializer::nop()`
	`587`	`+ // SAFETY: Read is guaranteed to work on uninitialized memory`
	`588`	`+ unsafe { Initializer::nop() }`
`587`	`589`	`}`
`588`	`590`	`}`
`589`	`591`	`#[stable(feature = "rust1", since = "1.0.0")]`
`@@ -622,7 +624,8 @@ impl Read for &TcpStream {`
`622`	`624`
`623`	`625`	`#[inline]`
`624`	`626`	`unsafe fn initializer(&self) -> Initializer {`
`625`		`- Initializer::nop()`
	`627`	`+ // SAFETY: Read is guaranteed to work on uninitialized memory`
	`628`	`+ unsafe { Initializer::nop() }`
`626`	`629`	`}`
`627`	`630`	`}`
`628`	`631`	`#[stable(feature = "rust1", since = "1.0.0")]`