svoid tok_runnableClasses(LS tok) {
  jreplace(tok, "runnable static record", "static runnable record");
  
  int i;
  while ((i = jfind(tok, "runnable record <id>")) >= 0) {
    int iOpening = indexOf(tok, i, "{");
    int iClosing = tok_findEndOfBlock(tok, iOpening)-1;
    tokSet_reTok(tok, iClosing, "}}");
    tokSet_reTok(tok, iOpening, "implements Runnable { run {");
    clearTokens_reTok(tok, i, i+2);
  }
  
  replaceKeywordBlock(tok, "runnable class <id>",
    "class $3 implements Runnable { run {",
    "}}");
}