Oops, a Lambda tends to forget what's its type.

Types.java

public class Types {
  
  interface SMI<T> {
    T get(T value);
  }

  public static void main(String[] args) {
    SMI<String> inner = new SMI<String>() {
      @Override
      public String get(String param) {
        return param;
      }
    };
    SMI<String> lambda = (String param) -> param;

    // public java.lang.String Types$1.get(java.lang.String)
    System.out.println(inner.getClass().getDeclaredMethods()[0]);     // Types are OK
    // Types.Types$SMI<java.lang.String>
    System.out.println(inner.getClass().getGenericInterfaces()[0]);   // Types are OK

    // public java.lang.Object Types$$Lambda$1.get(java.lang.Object)
    System.out.println(lambda.getClass().getDeclaredMethods()[0]);    // Oops... Types are erased
    // interface Types$SMI
    System.out.println(lambda.getClass().getGenericInterfaces()[0]);  // Oops... Types are erased
  }
}