While compiling the following:

// ---
public class X {
    public static void main(String [] args) {
        if (args __matches String) {
            System.out.println("Broken");
        }
    }
}

// ---
javac complains:

/home/srikanth/tmp/X.java:3: error: cannot find symbol
        if (args __matches String) {
                           ^
  symbol: variable String
  location: class X
1 error

This could be confusing to a user.