anchor.diff:  	X16 <- [4],X17 <- [3],X18 <- [fun() -> X16+X17 end],X19 <- [2],X20 <- [1]].
   
   no_generator(Config) when is_list(Config) ->
  -    ?line Seq = lists:seq(-10, 17),
  -    ?line [no_gen_verify(no_gen(A, B), A, B) || A <- Seq, B <- Seq],
  +    Seq = lists:seq(-10, 17),
  +    [no_gen_verify(no_gen(A, B), A, B) || A <- Seq, B <- Seq],
   
       %% Literal expression, for coverage.
  -    ?line [a] = [a || true],
  -    ?line [a,b,c] = [a || true] ++ [b,c],
  +    [a] = [a || true],
  +    [a,b,c] = [a || true] ++ [b,c],
       ok.
   
   no_gen(A, B) ->    
  
positive.code: no_gen_one_more(A, B) -> A + 1 =:= B.
  
  empty_generator(Config) when is_list(Config) ->
      ?line [] = [X || {X} <- [], (false or (X/0 > 3))],
      ok.
  
  no_export(Config) when is_list(Config) ->
  
negative.code:     ok.
  
  basic(Config) when is_list(Config) ->
      L0 = lists:seq(1, 10),
      L1 = my_map(fun(X) -> {x,X} end, L0),
      L1 = [{x,X} || X <- L0],
      L0 = my_map(fun({x,X}) -> X end, L1),
      [1,2,3,4,5] = [X || X <- L0, X < 6],
      [4,5,6] = [X || X <- L0, X > 3, X < 7],
      [] = [X || X <- L0, X > 32, X < 7],
      [1,3,5,7,9] = [X || X <- L0, odd(X)],
      [2,4,6,8,10] = [X || X <- L0, not odd(X)],
      [1,3,5,9] = [X || X <- L0, odd(X), X =/= 7],
      [2,4,8,10] = [X || X <- L0, not odd(X), X =/= 6],
  
      %% Append is specially handled.
      [1,3,5,9,2,4,8,10] = [X || X <- L0, odd(X), X =/= 7] ++
  	[X || X <- L0, not odd(X), X =/= 6],
  
      %% Guards BIFs are evaluated in guard context. Weird, but true.
      [{a,b,true},{x,y,true,true}] = [X || X <- tuple_list(), element(3, X)],
  
      %% Filter expressions with andalso/orelse.
      "abc123" = alphanum("?abc123.;"),
  
      %% Error cases.
      [] = [{xx,X} || X <- L0, element(2, X) == no_no_no],
      {'EXIT',_} = (catch [X || X <- L1, list_to_atom(X) == dum]),
      [] = [X || X <- L1, X+1 < 2],
      {'EXIT',_} = (catch [X || X <- L1, odd(X)]),
      fc([x], catch [E || E <- id(x)]),
      ok.
  
  tuple_list() ->
  