public void removeClosure() {
    ValidationHelper.validateTrue(closure != null, "closure shouldn't be null here");
    this.closure.getLabelEdges().remove(this);
    this.labeled = false;
    this.closure = null;
  }
Remove the closure of this edge. This edge will no
longer be labeled.
src/org/jetbrains/java/decompiler/modules/decompiler/StatEdge.java