Add some more unwind tests

They worked without modifications, but I wrote them so we're keeping them.

Issue #236

src/test/run-fail/unwind-lambda.rs

@@ -0,0 +1,16 @@
+// error-pattern:fail
+
+fn main() {
+    let cheese = "roquefort";
+    let carrots = @"crunchy";
+
+    fn (tasties: @str, macerate: &block(&str)) {
+        macerate(*tasties);
+    } (carrots, { |&food|
+        let mush = food + cheese;
+        lambda() {
+            let chew = mush + cheese;
+            fail "so yummy"
+        } ();
+    });
+}

src/test/run-fail/unwind-misc-1.rs

@@ -0,0 +1,28 @@
+// error-pattern:fail
+
+use std;
+import std::map;
+import std::uint;
+
+fn main() {
+    let count = @mutable 0u;
+    let hash = bind fn (_s: &[@str], count: @mutable uint) -> uint {
+        *count += 1u;
+        if *count == 10u {
+            fail;
+        } else {
+            ret *count;
+        }
+    } (_, count);
+
+    fn eq(s: &[@str], t: &[@str]) -> bool {
+        ret s == t;
+    }
+
+    let map = map::mk_hashmap(hash, eq);
+    let arr = [];
+    for each i in uint::range(0u, 10u) {
+        arr += [@"key stuff"];
+        map.insert(arr, arr + [@"value stuff"]);
+    }
+}