--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.asm/src/org/graalvm/compiler/asm/Label.java	Thu Jun 27 03:10:52 2019 +0200
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.asm/src/org/graalvm/compiler/asm/Label.java	Thu Jun 27 03:33:44 2019 +0200
@@ -26,6 +26,8 @@
 
 import java.util.ArrayList;
 
+import org.graalvm.compiler.debug.GraalError;
+
 /**
  * This class represents a label within assembly code.
  */
@@ -71,7 +73,9 @@
      * {@link #addPatchAt(int, Assembler)}.
      */
     protected void bind(int pos, Assembler asm) {
-        assert pos >= 0;
+        if (pos < 0) {
+            throw new GraalError("Cannot bind label to negative position %d", pos);
+        }
         this.position = pos;
         if (patchPositions != null) {
             for (int i = 0; i < patchPositions.size(); ++i) {