Index: tests/concurrent/semaphore.cfa
===================================================================
--- tests/concurrent/semaphore.cfa	(revision bbe3719f51f151b5ad865f6a0ca92c072ca4f23e)
+++ tests/concurrent/semaphore.cfa	(revision 237df76db82f504ef572c9139c965eb7aa1bfcfb)
@@ -2,4 +2,5 @@
 #include <locks.hfa>
 #include <thread.hfa>
+#include <mutex_stmt.hfa>
 
 enum { num_blockers = 17, num_unblockers = 13 };
@@ -28,5 +29,5 @@
 		thrash();
 		P(ben);
-		if(((thread&)this).seqable.next != 0p) sout | acquire |"Link not invalidated";
+		if(((thread&)this).seqable.next != 0p) mutex(sout) sout | "Link not invalidated";
 		thrash();
 	}
Index: tests/concurrent/sleep.cfa
===================================================================
--- tests/concurrent/sleep.cfa	(revision bbe3719f51f151b5ad865f6a0ca92c072ca4f23e)
+++ tests/concurrent/sleep.cfa	(revision 237df76db82f504ef572c9139c965eb7aa1bfcfb)
@@ -1,4 +1,5 @@
 #include <fstream.hfa>
 #include <thread.hfa>
+#include <mutex_stmt.hfa>
 #include <time.hfa>
 
@@ -29,5 +30,5 @@
 
 int main() {
-	sout | acquire | "start";
+	mutex( sout ) sout | "start";
 	{
 		slow_sleeper slow;
@@ -36,5 +37,5 @@
 		yield();
 	}
-	sout | acquire | "done";
+	mutex( sout ) sout | "done";
 }