Fix fast-check target by disabling code snippet printing on warnings (broken...

Fix fast-check target by disabling code snippet printing on warnings (broken on .rc files) and adding an xfail-fast flag for global-scope.rs.

src/comp/syntax/codemap.rs

@@ -63,7 +63,10 @@ fn emit_diagnostic(&option::t[span] sp, &str msg, &str kind, u8 color,
     alt (sp) {
         case (some(?ssp)) {
             ss = span_to_str(ssp, cm);
-            maybe_lines = some(span_to_lines(ssp, cm));
+
+            // FIXME: we're not able to look up lines read from .rc files yet.
+            // maybe_lines = some(span_to_lines(ssp, cm));
+
         }
         case (none) { }
     }

src/etc/combine-tests.py

@@ -25,7 +25,8 @@ for t in os.listdir(run_pass):
     if t.endswith(".rs"):
         f = codecs.open(os.path.join(run_pass, t), "r", "utf8")
         s = f.read()
-        if not ("xfail-stage2" in s):
+        if not ("xfail-stage2" in s or
+                "xfail-fast" in s):
             stage2_tests.append(t)
             if "main(vec[str] args)" in s:
                 take_args[t] = True

src/test/run-pass/global-scope.rs

 // xfail-stage0
+// xfail-fast
 
 fn f() -> int { ret 1; }