Change message send syntax from prefix "<<" to prefix "^"

packages/driver-timer/src/index.js

@@ -29,7 +29,7 @@ spawn named 'driver-timer/PeriodicTick' {
     let finish = Dataspace.backgroundTask();
     on start {
       handle = setInterval(Dataspace.wrapExternal(() => {
-        << PeriodicTick(intervalMS);
+        ^ PeriodicTick(intervalMS);
       }, intervalMS));
     }
     on stop {

packages/syntax-playground/src/assertionspeed.js

@@ -37,7 +37,7 @@ spawn named 'box' {
 spawn named 'client' {
   on asserted Protocol.BoxState($v) {
     console.log('client sending SetBox', v + 1);
-    << Protocol.SetBox(v + 1);
+    ^ Protocol.SetBox(v + 1);
   }
 
   on retracted Protocol.BoxState(_) {

packages/syntax-playground/src/messagespeed.js

@@ -23,13 +23,13 @@ const N = 100000;
 
 spawn {
   on start {
-    << 0;
+    ^ 0;
   }
   on message $v {
     if (v === N) {
       Dataspace.currentFacet().stop(() => { });
     } else {
-      << v + 1;
+      ^ v + 1;
     }
   }
 }

packages/syntax/src/generators.js

@@ -115,7 +115,7 @@ export function SyndicateTypeDefinition(node) {
 }
 
 export function MessageSendStatement(node) {
-  this.token("<<");
+  this.token("^");
   this.space();
   this.print(node.body, node);
   this.semicolon();

packages/syntax/src/parser.js

@@ -54,8 +54,8 @@ export default class SyndicateParser extends _original_Parser {
     let previousError = null;
 
     switch (this.state.type) {
-      case tt.bitShift:
-        if (this.hasPlugin("syndicate") && (this.state.value === "<<")) {
+      case tt.bitwiseXOR:
+        if (this.hasPlugin("syndicate")) {
           let result = this.withBacktracking(
             () => {
               this.next();