An HStatic cannot necessarily be generate at use site.

frog/leg/ssa/nodes.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
@@ skipping 1925 matching lines @@
 class HThrow extends HControlFlow {
   final bool isRethrow;
   HThrow(value, [this.isRethrow = false]) : super(<HInstruction>[value]);
   toString() => 'throw';
   accept(HVisitor visitor) => visitor.visitThrow(this);
 }
 
 class HStatic extends HInstruction {
   Element element;
   HStatic(this.element) : super(<HInstruction>[]) {
-    tryGenerateAtUseSite();
+    if (!element.isAssignable()) {
+      tryGenerateAtUseSite();
+    }
   }
+
   void prepareGvn() {
     assert(!hasSideEffects());
     if (!element.isAssignable()) {
       setUseGvn();
     }
   }
   toString() => 'static ${element.name}';
   accept(HVisitor visitor) => visitor.visitStatic(this);
 
   int gvnHashCode() => super.gvnHashCode() ^ element.hashCode();
@@ skipping 159 matching lines @@
 class HIfBlockInformation {
   final HIf branch;
   final SubGraph thenGraph;
   final SubGraph elseGraph;
   final HBasicBlock joinBlock;
   HIfBlockInformation(this.branch,
                       this.thenGraph,
                       this.elseGraph,
                       this.joinBlock);
 }