abstract sclass ALQLLine {
  toString { ret stdToString(this); }
}

sclass ALQLReturn > ALQLLine {
  S var;
  
  *() {}
  *(S *var) {}
  
  [stdEq]
}

static record ALQLReturnTuple(LS vars) extends ALQLLine {}

sclass ALQLTriple > ALQLLine {
  T3S triple;
  
  *() {}
  *(T3S *triple) {}
  *(S a, S b, S c) { triple = t3(a, b, c); }
  
  [stdEq]
}

sclass ALQLLockStatement > ALQLLine {
  T3S triple;
  
  *() {}
  *(T3S *triple) {}
  *(S a, S b, S c) { triple = t3(a, b, c); }
  
  [stdEq]  
}

sclass ALQLPage > ALQLLine {
  S page, matchMethod;
  
  *() {}
  *(S *page, S *matchMethod) {}
  
  [stdEq]
}

sclass ALQLSlice > ALQLLine {
  S slice;
  L<ALQLLine> contents;

  *() {}
  *(S *slice, L<ALQLLine> *contents) {}
  
  [stdEq]
}