Ignorable return of Java methods

Java allows you to ignore the return value of a method (as in C/C++):
StringBuffer sb = new StringBuffer; 
sb.append("abc");  -- returns a new StringBuffer object but is ignored
In programs, you can call a Java method and ignore the return value:
IMPORT JAVA java.util.lang.StringBuffer
  DEFINE sb StringBuffer
  LET sb = StringBuffer.create()
  LET sb = sb.append("abc")
  CALL sb.append("def")  -- typical usage