Remove Object.dynamic.

lib/compiler/implementation/ssa/builder.dart

Index: lib/compiler/implementation/ssa/builder.dart
diff --git a/lib/compiler/implementation/ssa/builder.dart b/lib/compiler/implementation/ssa/builder.dart
index f2fb383022adee59b8c2cbc3c464138a450a2c95..9baeb6c6ddfbdb3ce9db6e3800a32d700b716432 100644
--- a/lib/compiler/implementation/ssa/builder.dart
+++ b/lib/compiler/implementation/ssa/builder.dart
@@ -2398,24 +2398,33 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
     // If the invoke is on foreign code, don't visit the first
     // argument, which is the type, and the second argument,
     // which is the foreign code.
-    if (link.isEmpty() || link.isEmpty()) {
+    if (link.isEmpty() || link.tail.isEmpty()) {
       compiler.cancel('At least two arguments expected',
                       node: node.argumentsNode);
     }
-    link = link.tail.tail;
     List<HInstruction> inputs = <HInstruction>[];
-    addGenericSendArgumentsToList(link, inputs);
-    Node type = node.arguments.head;
-    Node literal = node.arguments.tail.head;
-    if (literal is !StringNode || literal.dynamic.isInterpolation) {
-      compiler.cancel('JS code must be a string literal', node: literal);
-    }
+    Node type = link.head;
+    Node code = link.tail.head;
+    addGenericSendArgumentsToList(link.tail.tail, inputs);
+
     if (type is !LiteralString) {
-      compiler.cancel(
-          'The type of a JS expression must be a string literal', node: type);
+      // The type must not be a juxtaposition or interpolation.
+      compiler.cancel('The type of a JS expression must be a string literal',
+                      node: type);
+    }
+    LiteralString typeString = type;
+
+    if (code is StringNode) {
+      StringNode codeString = code;
+      if (!codeString.isInterpolation) {
+        // codeString may not be an interpolation, but may be a juxtaposition.
+        push(new HForeign(codeString.dartString,
+                          typeString.dartString,
+                          inputs));
+        return;
+      }
     }
-    push(new HForeign(
-        literal.dynamic.dartString, type.dynamic.dartString, inputs));
+    compiler.cancel('JS code must be a string literal', node: literal);
   }
 
   void handleForeignUnintercepted(Send node) {