@Override
  public void visitClosureExpression(ClosureExpression expr) {
    super.visitClosureExpression(expr);
    replaceVisitedExpressionWith(expr);
  }
Groovy AST visitor that allows to replace both statements and expressions.

@author Peter Niederwieser
spock-core/src/main/java/org/spockframework/compiler/ExpressionReplacingVisitorSupport.java