void () { final StringBuilder builder = new StringBuilder(); String one = "bar" + builder.<warning descr="Call to 'StringBuilder.toString()' in concatenation">toString</warning>(); String two = 6 + builder.toString(); String three = builder.<warning descr="Call to 'StringBuilder.toString()' in concatenation">toString</warning>() + " "; String s = 1 + 2 + "as df" + builder.<warning descr="Call to 'StringBuilder.toString()' in concatenation">toString</warning>() + 1 + "asdf"; }