svoid test_tok_findBeginningOfJavaXTerm() {
  LS tok = javaTok([[ a~.b ]]);
  assertEqualsVerbose("a", get(tok, tok_findBeginningOfJavaXTerm(tok, indexOf(tok, "a"))));
  assertEqualsVerbose("a", get(tok, print(tok_findBeginningOfJavaXTerm(tok, print(indexOf(tok, "b"))))));
  tok = javaTok([[ = getGuild()~.getRoles() ]]);
  assertEqualsVerbose("getGuild", get(tok, tok_findBeginningOfJavaXTerm(tok, indexOf(tok, ")"))));
  
  test_tok_findBeginningOfJavaXTerm("ret o.~a", "o");
}

svoid test_tok_findBeginningOfJavaXTerm(S src, S token) {
  LS tok = javaTok(src);
  int i = indexOfAnySubList(tok, ll(".", "", "~"), ll("~", "", "."));
  printVars_str(+i);
  assertEqualsVerbose(token, get(tok, tok_findBeginningOfJavaXTerm(tok, i)));
}