Merge branch 'unwind'

Conflicts:
	src/comp/middle/trans.rs
	src/comp/middle/trans_build.rs
	src/lib/run_program.rs
	src/test/compiletest/runtest.rs

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"
+        } ();
+    });
+}