10 files changed, 29 insertions, 18 deletions
diff --git a/lib/stdlib/src/dict.erl b/lib/stdlib/src/dict.erl
index e3bfb6c2e2..7e198a2469 100644
--- a/lib/stdlib/src/dict.erl
+++ b/lib/stdlib/src/dict.erl
@@ -36,7 +36,7 @@
 -module(dict).
 
 %% Standard interface.
--export([new/0,is_key/2,to_list/1,from_list/1,size/1]).
+-export([new/0,is_key/2,to_list/1,from_list/1,size/1,is_empty/1]).
 -export([fetch/2,find/2,fetch_keys/1,erase/2]).
 -export([store/3,append/3,append_list/3,update/3,update/4,update_counter/3]).
 -export([fold/3,map/2,filter/2,merge/3]).
@@ -112,6 +112,11 @@ from_list(L) ->
 
 size(#dict{size=N}) when is_integer(N), N >= 0 -> N. 
 
+-spec is_empty(Dict) -> boolean() when
+      Dict :: dict().
+
+is_empty(#dict{size=N}) -> N =:= 0.
+
 -spec fetch(Key, Dict) -> Value when
       Key :: term(),
       Dict :: dict(),
@@ -386,7 +391,7 @@ merge(F, D1, D2) ->
 		      update(K, fun (V1) -> F(K, V1, V2) end, V2, D)
 	      end, D1, D2).
 
-
+
 %% get_slot(Hashdb, Key) -> Slot.
 %%  Get the slot.  First hash on the new range, if we hit a bucket
 %%  which has not been split use the unsplit buddy bucket.
diff --git a/lib/stdlib/src/erl_eval.erl b/lib/stdlib/src/erl_eval.erl
index 73b8da335a..ca6a4b5c58 100644
--- a/lib/stdlib/src/erl_eval.erl
+++ b/lib/stdlib/src/erl_eval.erl
@@ -912,7 +912,7 @@ type_test(binary) -> is_binary;
 type_test(record) -> is_record;
 type_test(Test) -> Test.
 
-
+
 %% match(Pattern, Term, Bindings) ->
 %%	{match,NewBindings} | nomatch
 %%      or erlang:error({illegal_pattern, Pattern}).
@@ -1051,7 +1051,7 @@ match_list([], [], Bs, _BBs) ->
     {match,Bs};
 match_list(_, _, _Bs, _BBs) ->
     nomatch.
-
+
 %% new_bindings()
 %% bindings(Bindings)
 %% binding(Name, Bindings)
diff --git a/lib/stdlib/src/erl_tar.erl b/lib/stdlib/src/erl_tar.erl
index f49c2a64f4..40b48d7999 100644
--- a/lib/stdlib/src/erl_tar.erl
+++ b/lib/stdlib/src/erl_tar.erl
@@ -219,7 +219,7 @@ format_error(Atom) when is_atom(Atom) ->
 format_error(Term) ->
     lists:flatten(io_lib:format("~tp", [Term])).
 
-
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%%
 %%%	Useful definitions (also start of implementation).
@@ -409,7 +409,7 @@ split_filename([Comp|Rest], Prefix, Suffix, Len) ->
 split_filename([], Prefix, Suffix, _) ->
     {filename:join(Prefix),filename:join(Suffix)}.
 
-
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%%
 %%% 	Retrieving files from a tape archive.
diff --git a/lib/stdlib/src/filelib.erl b/lib/stdlib/src/filelib.erl
index 5b7bc0ab21..a266daa084 100644
--- a/lib/stdlib/src/filelib.erl
+++ b/lib/stdlib/src/filelib.erl
@@ -248,7 +248,7 @@ ensure_dir(F) ->
 	    end
     end.
 
-
+
 %%%
 %%% Pattern matching using a compiled wildcard.
 %%%
@@ -360,7 +360,7 @@ do_alt([], _File) ->
 
 do_list_dir(Dir, Mod) ->     eval_list_dir(Dir, Mod).
 
-	    
+	    
 %%% Compiling a wildcard.
 
 %% Only for debugging.
diff --git a/lib/stdlib/src/gen_server.erl b/lib/stdlib/src/gen_server.erl
index 6776f3deaa..5f14e48b0a 100644
--- a/lib/stdlib/src/gen_server.erl
+++ b/lib/stdlib/src/gen_server.erl
@@ -393,7 +393,7 @@ decode_msg(Msg, Parent, Name, State, Mod, Time, Debug, Hib) ->
     end.
 
 %%% ---------------------------------------------------
-%%% Send/recive functions
+%%% Send/receive functions
 %%% ---------------------------------------------------
 do_send(Dest, Msg) ->
     case catch erlang:send(Dest, Msg, [noconnect]) of
diff --git a/lib/stdlib/src/io_lib.erl b/lib/stdlib/src/io_lib.erl
index 53781e97f1..375d05f359 100644
--- a/lib/stdlib/src/io_lib.erl
+++ b/lib/stdlib/src/io_lib.erl
@@ -582,7 +582,7 @@ printable_unicode_list(_) -> false.		%Everything else is false
 
 nl() ->
     "\n".
-
+
 %%
 %% Utilities for collecting characters in input files
 %%
diff --git a/lib/stdlib/src/lists.erl b/lib/stdlib/src/lists.erl
index b5577165f4..d6a9f4645d 100644
--- a/lib/stdlib/src/lists.erl
+++ b/lib/stdlib/src/lists.erl
@@ -630,7 +630,7 @@ flatlength([H|T], L) when is_list(H) ->
 flatlength([_|T], L) ->
     flatlength(T, L + 1);
 flatlength([], L) -> L.
-
+
 %% keymember(Key, Index, [Tuple]) Now a BIF!
 %% keyfind(Key, Index, [Tuple]) A BIF!
 %% keysearch(Key, Index, [Tuple]) Now a BIF!
@@ -1163,7 +1163,7 @@ rumerge(T1, []) ->
     T1;
 rumerge(T1, [H2 | T2]) ->
     lists:reverse(rumerge2_1(T1, T2, [], H2), []).
-
+
 %% all(Predicate, List)
 %% any(Predicate, List)
 %% map(Function, List)
diff --git a/lib/stdlib/src/math.erl b/lib/stdlib/src/math.erl
index c3fb684ec3..98a70b1644 100644
--- a/lib/stdlib/src/math.erl
+++ b/lib/stdlib/src/math.erl
@@ -51,9 +51,9 @@ asinh(_) ->
 atan(_) ->
     erlang:nif_error(undef).
 
--spec atan2(X, Y) -> float() when
-      X :: number(),
-      Y :: number().
+-spec atan2(Y, X) -> float() when
+      Y :: number(),
+      X :: number().
 atan2(_, _) ->
     erlang:nif_error(undef).
 
diff --git a/lib/stdlib/src/orddict.erl b/lib/stdlib/src/orddict.erl
index 45d3c84b3e..da60fc1bb6 100644
--- a/lib/stdlib/src/orddict.erl
+++ b/lib/stdlib/src/orddict.erl
@@ -20,7 +20,7 @@
 -module(orddict).
 
 %% Standard interface.
--export([new/0,is_key/2,to_list/1,from_list/1,size/1]).
+-export([new/0,is_key/2,to_list/1,from_list/1,size/1,is_empty/1]).
 -export([fetch/2,find/2,fetch_keys/1,erase/2]).
 -export([store/3,append/3,append_list/3,update/3,update/4,update_counter/3]).
 -export([fold/3,map/2,filter/2,merge/3]).
@@ -64,6 +64,12 @@ from_list(Pairs) ->
 
 size(D) -> length(D).
 
+-spec is_empty(Orddict) -> boolean() when
+      Orddict :: orddict().
+
+is_empty([]) -> true;
+is_empty([_|_]) -> false.
+
 -spec fetch(Key, Orddict) -> Value when
       Key :: term(),
       Value :: term(),
diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index 0675afb877..f9b083a56d 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -256,7 +256,7 @@ chars(C, N, Tail) when N > 0 ->
     chars(C, N-1, [C|Tail]);
 chars(C, 0, Tail) when is_integer(C) ->
     Tail.
-
+
 %% Torbjörn's bit.
 
 %%% COPIES %%%
@@ -460,7 +460,7 @@ sub_string(String, Start) -> substr(String, Start).
       Stop :: pos_integer().
 
 sub_string(String, Start, Stop) -> substr(String, Start, Stop - Start + 1).
-
+
 %% ISO/IEC 8859-1 (latin1) letters are converted, others are ignored
 %%