@Override
  public void visitSynchronizedStatement(SynchronizedStatement stat) {
    stat.setExpression(replaceExpr(stat.getExpression()));
    stat.setCode(replace(stat.getCode()));
  }
Groovy AST visitor that allows to replace both statements and expressions.

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