Un-XFAIL some tests that now pass.

Author: catamorphism

src/test/compile-fail/impure-pred.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 // error-pattern: impure function
 
 fn g() -> () {}

src/test/compile-fail/missing-return.rs

@@ -1,6 +1,4 @@
 // xfail-stage0
-// xfail-stage1
-// xfail-stage2
 // error-pattern: return
 
 fn f() -> int {

src/test/compile-fail/not-a-pred-2.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 
 // error-pattern: non-predicate
 

src/test/compile-fail/not-a-pred-3.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 
 // error-pattern: expected the constraint name
 

src/test/compile-fail/not-a-pred-check.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 // error-pattern: non-predicate
 
 fn f(int q) -> bool { ret true; }

src/test/compile-fail/not-pred-args.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 
 // error-pattern: Constraint args must be
 

src/test/compile-fail/pattern-tyvar-2.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 
 use std;
 import std::option;

src/test/compile-fail/pred-not-bool.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 
 // error-pattern: Non-boolean return type
 

src/test/run-pass/box-inside-if.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 use std;
 import std::vec;
 

src/test/run-pass/box-inside-if2.rs

@@ -1,5 +1,4 @@
 // -*- rust -*-
-// xfail-stage0
 use std;
 import std::vec;