Add xfail-pretty directives to tests that don't pretty-print correctly

Issue #789

src/test/run-pass/alt-str.rs

@@ -1,3 +1,4 @@
+// xfail-pretty
 // Issue #53
 
 fn main() {

src/test/run-pass/block-expr-precedence.rs

@@ -1,3 +1,4 @@
+// xfail-pretty
 // no-reformat
 
 /*

src/test/run-pass/constrained-type.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 // -*- rust -*-
 
 tag list { cons(int, @list); nil; }

src/test/run-pass/fun-call-variants.rs

@@ -1,4 +1,4 @@
-
+// xfail-pretty
 
 
 // -*- rust -*-

src/test/run-pass/hashmap-memory.rs

@@ -1,3 +1,4 @@
+// xfail-pretty
 /**
    A somewhat reduced test case to expose some Valgrind issues.
 

src/test/run-pass/if-check-precond.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 pred even(x: uint) -> bool {
     if x < 2u {
         ret false;

src/test/run-pass/if-ret.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 fn foo() { if (ret) { } }
 
 fn main() { foo(); }

src/test/run-pass/issue-687.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 
 use std;
 import std::ivec;

src/test/run-pass/item-attributes.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 
 // These are attributes of the implicit crate. Really this just needs to parse
 // for completeness since .rs files linked from .rc files support this

src/test/run-pass/macro-by-example-2.rs

@@ -1,3 +1,5 @@
+// xfail-pretty
+
 fn main() {
     #macro([#zip_or_unzip[[x, ...], [y, ...]], [[x, y], ...]],
            [#zip_or_unzip[[xx, yy], ...], [[xx, ...], [yy, ...]]]);

src/test/run-pass/pattern-bound-var-in-for-each.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 // Tests that trans_path checks whether a
 // pattern-bound var is an upvar (when translating
 // the for-each body)

src/test/run-pass/swap-2.rs

@@ -1,3 +1,5 @@
+// xfail-pretty
+
 fn swap[@T](v: &vec[mutable T], i: int, j: int) { v.(i) <-> v.(j); }
 
 fn main() {

src/test/run-pass/syntax-extension-fmt.rs

@@ -1,3 +1,4 @@
+// xfail-pretty
 
 use std;
 import std::str;

src/test/run-pass/task-comm.rs

@@ -1,4 +1,5 @@
 // xfail-stage0
+// xfail-pretty
 
 use std;
 

src/test/run-pass/typestate-transitive.rs

@@ -1,3 +1,5 @@
+// xfail-pretty
+
 pred p(i: int) -> bool { true }
 
 fn f(i: int) : p(i) -> int { i }

src/test/run-pass/while-prelude-drop.rs

@@ -1,4 +1,4 @@
-
+// xfail-pretty
 
 tag t { a; b(str); }