---

yaml
---
r: 136408
b: refs/heads/dist-snap
c: eafeb33
h: refs/heads/master
v: v3

Author: nikomatsakis

[refs]

@@ -6,7 +6,7 @@ refs/heads/try: 189b7332968972f34cdbbbd9b62d97ababf53059
 refs/tags/release-0.1: 1f5c5126e96c79d22cb7862f75304136e204f105
 refs/heads/ndm: f3868061cd7988080c30d6d5bf352a5a5fe2460b
 refs/heads/try2: 147ecfdd8221e4a4d4e090486829a06da1e0ca3c
-refs/heads/dist-snap: 48bc291a80085978987d13f75b70b82b69ec9b4d
+refs/heads/dist-snap: eafeb335a0731b4bfcd8be6203d0d29a3668cd76
 refs/tags/release-0.2: c870d2dffb391e14efb05aa27898f1f6333a9596
 refs/tags/release-0.3: b5f0d0f648d9a6153664837026ba1be43d3e2503
 refs/heads/try3: 9387340aab40a73e8424c48fd42f0c521a4875c0

branches/dist-snap/src/doc/guide-unsafe.md

@@ -461,11 +461,12 @@ fn start(_argc: int, _argv: *const *const u8) -> int {
     0
 }
 
-// These functions are invoked by the compiler, but not
+// These functions and traits are used by the compiler, but not
 // for a bare-bones hello world. These are normally
 // provided by libstd.
 #[lang = "stack_exhausted"] extern fn stack_exhausted() {}
 #[lang = "eh_personality"] extern fn eh_personality() {}
+#[lang = "sized"] trait Sized { }
 # // fn main() {} tricked you, rustdoc!
 ```
 
@@ -488,13 +489,14 @@ pub extern fn main(argc: int, argv: *const *const u8) -> int {
 
 #[lang = "stack_exhausted"] extern fn stack_exhausted() {}
 #[lang = "eh_personality"] extern fn eh_personality() {}
+#[lang = "sized"] trait Sized { }
 # // fn main() {} tricked you, rustdoc!
 ```
 
 
 The compiler currently makes a few assumptions about symbols which are available
 in the executable to call. Normally these functions are provided by the standard
-library, but without it you must define your own.
+xlibrary, but without it you must define your own.
 
 The first of these two functions, `stack_exhausted`, is invoked whenever stack
 overflow is detected.  This function has a number of restrictions about how it
@@ -508,6 +510,12 @@ mechanisms of the compiler. This is often mapped to GCC's personality function
 information), but crates which do not trigger failure can be assured that this
 function is never called.
 
+The final item in the example is a trait called `Sized`. This a trait
+that represents data of a known static size: it is integral to the
+Rust type system, and so the compiler expects the standard library to
+provide it. Since you are not using the standard library, you have to
+provide it yourself.
+
 ## Using libcore
 
 > **Note**: the core library's structure is unstable, and it is recommended to
@@ -686,6 +694,7 @@ fn main(argc: int, argv: *const *const u8) -> int {
 
 #[lang = "stack_exhausted"] extern fn stack_exhausted() {}
 #[lang = "eh_personality"] extern fn eh_personality() {}
+#[lang = "sized"] trait Sized {}
 ```
 
 Note the use of `abort`: the `exchange_malloc` lang item is assumed to