diff --git a/src/test/run-pass/arith-0.rs b/src/test/run-pass/arith-0.rs
new file mode 100644
index 00000000000..7587b0050ad
--- /dev/null
+++ b/src/test/run-pass/arith-0.rs
@@ -0,0 +1,5 @@
+fn main() -> () {
+    let int a = 10;
+    log a;
+    check (a * (a - 1) == 90);
+}
\ No newline at end of file
diff --git a/src/test/run-pass/arith-1.rs b/src/test/run-pass/arith-1.rs
new file mode 100644
index 00000000000..bac6a055e80
--- /dev/null
+++ b/src/test/run-pass/arith-1.rs
@@ -0,0 +1,22 @@
+fn main() -> () {
+    let int i32_a = 10;
+    check(i32_a == 10);
+    check(i32_a - 10 == 0);
+    check(i32_a / 10 == 1);
+    check(i32_a - 20 == -10);
+    check(i32_a << 10 == 10240);
+    check(i32_a << 16 == 655360);
+    check(i32_a * 16 == 160);
+    check(i32_a * i32_a * i32_a == 1000);
+    check(i32_a * i32_a * i32_a * i32_a == 10000);
+    check(((i32_a * i32_a) / i32_a) * i32_a == 100);
+    check(i32_a * (i32_a - 1) << 2 + i32_a == 368640);
+
+    let int i32_b = 0x10101010;
+    check(i32_b + 1 - 1 == i32_b);
+    check(i32_b << 1 == i32_b << 1);
+    check(i32_b >> 1 == i32_b >> 1);
+    check((i32_b & (i32_b << 1)) == 0);
+    log ((i32_b | (i32_b << 1)));
+    check((i32_b | (i32_b << 1)) == 0x30303030);
+}
\ No newline at end of file
diff --git a/src/test/run-pass/arith-2.rs b/src/test/run-pass/arith-2.rs
new file mode 100644
index 00000000000..33a740c84fc
--- /dev/null
+++ b/src/test/run-pass/arith-2.rs
@@ -0,0 +1,5 @@
+fn main() -> () {
+    let int i32_c = 0x10101010;
+    check (i32_c + i32_c * 2 / 3 * 2 + (i32_c - 7 % 3) == 
+           i32_c + (((i32_c * 2) / 3) * 2) + (i32_c - (7 % 3)));
+}
\ No newline at end of file
diff --git a/src/test/run-pass/basic-1.rs b/src/test/run-pass/basic-1.rs
new file mode 100644
index 00000000000..bdd7ee25641
--- /dev/null
+++ b/src/test/run-pass/basic-1.rs
@@ -0,0 +1,25 @@
+// -*- rust -*-
+
+io fn a(chan[int] c) {
+    c <| 10;
+}
+
+io fn main() {
+    let port[int] p = port();
+    spawn a(chan(p));
+    spawn b(chan(p));
+    let int n = 0;
+    n <- p;
+    n <- p;
+//    log "Finished.";
+}
+
+io fn b(chan[int] c) {
+//    log "task b0";
+//    log "task b1";
+//    log "task b2";
+//    log "task b3";
+//    log "task b4";
+//    log "task b5";
+    c <| 10;
+}
\ No newline at end of file
diff --git a/src/test/run-pass/basic-2.rs b/src/test/run-pass/basic-2.rs
new file mode 100644
index 00000000000..975a0d4b896
--- /dev/null
+++ b/src/test/run-pass/basic-2.rs
@@ -0,0 +1,26 @@
+// -*- rust -*-
+
+io fn a(chan[int] c) {
+    log "task a0";
+    log "task a1";
+    c <| 10;
+}
+
+io fn main() {
+    let port[int] p = port();
+    spawn a(chan(p));
+    spawn b(chan(p));
+    let int n = 0;
+    n <- p;
+    n <- p;
+    log "Finished.";
+}
+
+io fn b(chan[int] c) {
+    log "task b0";
+    log "task b1";
+    log "task b2";
+    log "task b2";
+    log "task b3";
+    c <| 10;
+}
diff --git a/src/test/run-pass/task-comm-0.rs b/src/test/run-pass/task-comm-0.rs
index 5992ba5cf6f..28294422b5c 100644
--- a/src/test/run-pass/task-comm-0.rs
+++ b/src/test/run-pass/task-comm-0.rs
@@ -15,5 +15,5 @@ io fn test05() {
     let int value <- po;
     value <- po;
     value <- po;
-    log value;
+    check(value == 30);
 }
diff --git a/src/test/run-pass/task-comm-2.rs b/src/test/run-pass/task-comm-2.rs
index 9c85da34cc2..864d49de1e0 100644
--- a/src/test/run-pass/task-comm-2.rs
+++ b/src/test/run-pass/task-comm-2.rs
@@ -1,8 +1,8 @@
 fn main() -> () {    
-    log "===== THREADS =====";
+    log "===== SPAWNING and JOINING TASKS =====";
+    test00(false);
+    log "===== SPAWNING and JOINING THREAD TASKS =====";
     test00(true);
-    log "====== TASKS ======";
-   // test00(false);
 }
 
 fn start(int task_number) {
@@ -15,7 +15,7 @@ fn start(int task_number) {
 }
     
 fn test00(bool create_threads) {
-    let int number_of_tasks = 0;
+    let int number_of_tasks = 8;
     
     let int i = 0;
     let vec[task] tasks = vec();
diff --git a/src/test/run-pass/task-comm-3.rs b/src/test/run-pass/task-comm-3.rs
index 6dd620cc762..9a3f9e16919 100644
--- a/src/test/run-pass/task-comm-3.rs
+++ b/src/test/run-pass/task-comm-3.rs
@@ -1,6 +1,8 @@
 io fn main() -> () {
-   log "===== THREADS =====";
+   log "===== WITHOUT THREADS =====";
    test00(false);
+   log "====== WITH THREADS ======";
+   test00(true);
 }
 
 io fn test00_start(chan[int] ch, int message, int count) {
@@ -15,8 +17,9 @@ io fn test00_start(chan[int] ch, int message, int count) {
 }
 
 io fn test00(bool is_multithreaded) {
-    let int number_of_tasks = 1;
-    let int number_of_messages = 0;
+    let int number_of_tasks = 16;
+    let int number_of_messages = 4;
+    
     log "Creating tasks";
     
     let port[int] po = port();
@@ -27,13 +30,13 @@ io fn test00(bool is_multithreaded) {
     // Create and spawn tasks...
     let vec[task] tasks = vec();
     while (i < number_of_tasks) {
-        i = i + 1;
         if (is_multithreaded) {
             tasks += vec(
                 spawn thread test00_start(ch, i, number_of_messages));
         } else {
             tasks += vec(spawn test00_start(ch, i, number_of_messages));
         }
+        i = i + 1;
     }
     
     // Read from spawned tasks...
@@ -53,7 +56,7 @@ io fn test00(bool is_multithreaded) {
     }
     
     log "Completed: Final number is: ";
-    check (sum + 1 == number_of_messages * 
-           (number_of_tasks * number_of_tasks + number_of_tasks) / 2);
-    log sum;
-}
\ No newline at end of file
+    // check (sum == (((number_of_tasks * (number_of_tasks - 1)) / 2) * 
+    //       number_of_messages));
+    check (sum == 480);
+}
diff --git a/src/test/run-pass/task-comm-6.rs b/src/test/run-pass/task-comm-6.rs
index c579a98ca0a..2774c0ba545 100644
--- a/src/test/run-pass/task-comm-6.rs
+++ b/src/test/run-pass/task-comm-6.rs
@@ -31,6 +31,8 @@ io fn test00() {
         r <- p; sum += r;
         i += 1;
     }
-    
-    check (sum == 4 * ((number_of_messages * (number_of_messages - 1)) / 2));
+
+    check (sum == 1998000);
+    // check (sum == 4 * ((number_of_messages * 
+    //                   (number_of_messages - 1)) / 2));
 }
\ No newline at end of file
diff --git a/src/test/run-pass/task-comm.rs b/src/test/run-pass/task-comm.rs
index ef71c6e1bcf..3c5d321689f 100644
--- a/src/test/run-pass/task-comm.rs
+++ b/src/test/run-pass/task-comm.rs
@@ -1,11 +1,11 @@
 
-fn main() -> () {
-    // test00(true);
+io fn main() -> () {
+    test00(true);
     // test01();
-    // test02();
-    // test03();
-    // test04();
-    // test05();
+    test02();
+    test03();
+    test04();
+    test05();
     test06();
 }
 
@@ -22,7 +22,7 @@ io fn test00_start(chan[int] ch, int message, int count) {
 
 io fn test00(bool is_multithreaded) {
     let int number_of_tasks = 1;
-    let int number_of_messages = 64;
+    let int number_of_messages = 4;
     log "Creating tasks";
     
     let port[int] po = port();
@@ -103,7 +103,7 @@ fn test04_start() {
 
 fn test04() {
     log "Spawning lots of tasks.";
-    let int i = 64;
+    let int i = 4;
     while (i > 0) {
         i = i - 1;
         spawn thread test04_start();
@@ -139,7 +139,7 @@ fn test06_start(int task_number) {
 }
     
 fn test06() {
-    let int number_of_tasks = 32;
+    let int number_of_tasks = 4;
     log "Creating tasks";
     
     let int i = 0;