remove die definition and use in doc tests

doc/rust.md

@@ -686,15 +686,15 @@ mod math {
     type complex = (f64, f64);
     fn sin(f: f64) -> f64 {
         ...
-# die!();
+# fail!();
     }
     fn cos(f: f64) -> f64 {
         ...
-# die!();
+# fail!();
     }
     fn tan(f: f64) -> f64 {
         ...
-# die!();
+# fail!();
     }
 }
 ~~~~~~~~
@@ -986,7 +986,7 @@ output slot type would normally be. For example:
 ~~~~
 fn my_err(s: &str) -> ! {
     log(info, s);
-    die!();
+    fail!();
 }
 ~~~~
 
@@ -1004,7 +1004,7 @@ were declared without the `!` annotation, the following code would not
 typecheck:
 
 ~~~~
-# fn my_err(s: &str) -> ! { die!() }
+# fn my_err(s: &str) -> ! { fail!() }
 
 fn f(i: int) -> int {
    if i == 42 {
@@ -2284,9 +2284,9 @@ enum List<X> { Nil, Cons(X, @List<X>) }
 let x: List<int> = Cons(10, @Cons(11, @Nil));
 
 match x {
-    Cons(_, @Nil) => die!(~"singleton list"),
+    Cons(_, @Nil) => fail!(~"singleton list"),
     Cons(*)       => return,
-    Nil           => die!(~"empty list")
+    Nil           => fail!(~"empty list")
 }
 ~~~~
 
@@ -2323,7 +2323,7 @@ match x {
         return;
     }
     _ => {
-        die!();
+        fail!();
     }
 }
 ~~~~
@@ -2411,7 +2411,7 @@ guard may refer to the variables bound within the pattern they follow.
 let message = match maybe_digit {
   Some(x) if x < 10 => process_digit(x),
   Some(x) => process_other(x),
-  None => die!()
+  None => fail!()
 };
 ~~~~
 

doc/tutorial-macros.md

@@ -218,7 +218,7 @@ match x {
                 // complicated stuff goes here
                 return result + val;
             },
-            _ => die!(~"Didn't get good_2")
+            _ => fail!(~"Didn't get good_2")
         }
     }
     _ => return 0 // default value
@@ -260,7 +260,7 @@ macro_rules! biased_match (
 biased_match!((x)       ~ (good_1(g1, val)) else { return 0 };
               binds g1, val )
 biased_match!((g1.body) ~ (good_2(result) )
-                  else { die!(~"Didn't get good_2") };
+                  else { fail!(~"Didn't get good_2") };
               binds result )
 // complicated stuff goes here
 return result + val;
@@ -362,7 +362,7 @@ macro_rules! biased_match (
 # fn f(x: t1) -> uint {
 biased_match!(
     (x)       ~ (good_1(g1, val)) else { return 0 };
-    (g1.body) ~ (good_2(result) ) else { die!(~"Didn't get good_2") };
+    (g1.body) ~ (good_2(result) ) else { fail!(~"Didn't get good_2") };
     binds val, result )
 // complicated stuff goes here
 return result + val;

doc/tutorial-tasks.md

@@ -313,7 +313,7 @@ of all tasks are intertwined: if one fails, so do all the others.
 # fn do_some_work() { loop { task::yield() } }
 # do task::try {
 // Create a child task that fails
-do spawn { die!() }
+do spawn { fail!() }
 
 // This will also fail because the task we spawned failed
 do_some_work();
@@ -337,7 +337,7 @@ let result: Result<int, ()> = do task::try {
     if some_condition() {
         calculate_result()
     } else {
-        die!(~"oops!");
+        fail!(~"oops!");
     }
 };
 assert result.is_err();
@@ -370,14 +370,14 @@ proceed). Hence, you will need different _linked failure modes_.
 ## Failure modes
 
 By default, task failure is _bidirectionally linked_, which means that if
-either task dies, it kills the other one.
+either task fails, it kills the other one.
 
 ~~~
 # fn sleep_forever() { loop { task::yield() } }
 # do task::try {
 do task::spawn {
     do task::spawn {
-        die!();  // All three tasks will die.
+        fail!();  // All three tasks will fail.
     }
     sleep_forever();  // Will get woken up by force, then fail
 }
@@ -386,7 +386,7 @@ sleep_forever();  // Will get woken up by force, then fail
 ~~~
 
 If you want parent tasks to be able to kill their children, but do not want a
-parent to die automatically if one of its child task dies, you can call
+parent to fail automatically if one of its child task fails, you can call
 `task::spawn_supervised` for _unidirectionally linked_ failure. The
 function `task::try`, which we saw previously, uses `spawn_supervised`
 internally, with additional logic to wait for the child task to finish
@@ -432,7 +432,7 @@ do task::spawn_supervised {
     // Intermediate task immediately exits
 }
 wait_for_a_while();
-die!();  // Will kill grandchild even if child has already exited
+fail!();  // Will kill grandchild even if child has already exited
 # };
 ~~~
 
@@ -446,10 +446,10 @@ other at all, using `task::spawn_unlinked` for _isolated failure_.
 let (time1, time2) = (random(), random());
 do task::spawn_unlinked {
     sleep_for(time2);  // Won't get forced awake
-    die!();
+    fail!();
 }
 sleep_for(time1);  // Won't get forced awake
-die!();
+fail!();
 // It will take MAX(time1,time2) for the program to finish.
 # };
 ~~~

src/libsyntax/ext/expand.rs

@@ -287,15 +287,6 @@ pub fn core_macros() -> ~str {
     macro_rules! debug ( ($( $arg:expr ),+) => (
         log(::core::debug, fmt!( $($arg),+ )) ))
 
-    macro_rules! die(
-        ($msg: expr) => (
-            ::core::sys::begin_unwind($msg, file!().to_owned(), line!())
-        );
-        () => (
-            fail!(~\"explicit failure\")
-        )
-    )
-
     macro_rules! fail(
         ($msg: expr) => (
             ::core::sys::begin_unwind($msg, file!().to_owned(), line!())