Fix an erroneous spec

While at it, take out redundant code.

3 files changed, 12 insertions, 20 deletions

diff --git a/lib/syntax_tools/src/erl_comment_scan.erl b/lib/syntax_tools/src/erl_comment_scan.erl
index 09ce21a428..e2c6976a2b 100644
--- a/lib/syntax_tools/src/erl_comment_scan.erl
+++ b/lib/syntax_tools/src/erl_comment_scan.erl
@@ -273,12 +273,8 @@ join_lines([], Txt, L, Col, Ind) ->
 
 filename([C|T]) when is_integer(C), C > 0, C =< 255 ->
     [C | filename(T)];
-filename([H|T]) ->
-    filename(H) ++ filename(T);
 filename([]) ->
     [];
-filename(N) when is_atom(N) ->
-    atom_to_list(N);
 filename(N) ->
     report_error("bad filename: `~P'.", [N, 25]),
     exit(error).
diff --git a/lib/syntax_tools/src/erl_prettypr.erl b/lib/syntax_tools/src/erl_prettypr.erl
index 606441bcf1..c2c72d1ed2 100644
--- a/lib/syntax_tools/src/erl_prettypr.erl
+++ b/lib/syntax_tools/src/erl_prettypr.erl
@@ -384,7 +384,7 @@ lay_postcomments(Cs, D) ->
     beside(D, floating(break(stack_comments(Cs, true)), 1, 0)).
 
 %% Format (including padding, if `Pad' is `true', otherwise not)
-%% and stack the listed comments above each other,
+%% and stack the listed comments above each other.
 
 stack_comments([C | Cs], Pad) ->
     D = stack_comment_lines(erl_syntax:comment_text(C)),
@@ -405,9 +405,7 @@ stack_comments([C | Cs], Pad) ->
 	    D1;	   % done
 	_ ->
 	    above(D1, stack_comments(Cs, Pad))
-    end;
-stack_comments([], _) ->
-    empty().
+    end.
 
 %% Stack lines of text above each other and prefix each string in
 %% the list with a single `%' character.
diff --git a/lib/syntax_tools/src/igor.erl b/lib/syntax_tools/src/igor.erl
index e92e9593b6..702b399615 100644
--- a/lib/syntax_tools/src/igor.erl
+++ b/lib/syntax_tools/src/igor.erl
@@ -699,7 +699,7 @@ merge_files(Name, Trees, Files, Opts) ->
 		options	   :: [option()]
 	       }).
 
--spec merge_sources(atom(), erl_syntax:forms(), [option()]) ->
+-spec merge_sources(atom(), [erl_syntax:forms()], [option()]) ->
         {erl_syntax:syntaxTree(), [stubDescriptor()]}.
 
 merge_sources(Name, Sources, Opts) ->
@@ -782,12 +782,12 @@ merge_sources_1(Name, Modules, Trees, Opts) ->
     %% however not "safe" by default. If no modules are explicitly
     %% specified as static, it is assumed that *all* are static.
     Static0 = ordsets:from_list(proplists:append_values(static, Opts)),
-    case proplists:is_defined(static, Opts) of
-	false ->
-	    Static = All;
-	true ->
-	    Static = ordsets:add_element(Name, Static0)
-    end,
+    Static = case proplists:is_defined(static, Opts) of
+		 false ->
+		     All;
+		 true ->
+		     ordsets:add_element(Name, Static0)
+	     end,
     check_module_names(Static, All, "declared 'static'"),
     verbose("static modules: ~p.", [Static], Opts),
 
@@ -806,8 +806,8 @@ merge_sources_1(Name, Modules, Trees, Opts) ->
     verbose("safe modules: ~p.", [Safe], Opts),
 
     Preserved = (ordsets:is_element(Name, Sources)
-		 and ordsets:is_element(Name, Export))
-	or proplists:get_bool(no_banner, Opts),
+		 andalso ordsets:is_element(Name, Export))
+	orelse proplists:get_bool(no_banner, Opts),
     NoHeaders = proplists:get_bool(no_headers, Opts),
     Notes = proplists:get_value(notes, Opts, always),
     Rs = proplists:append_values(redirect, Opts),
@@ -2924,9 +2924,7 @@ make_attribute({Name, Term}) ->
 			 [erl_syntax:abstract(Term)]).
 
 is_auto_import({F, A}) ->
-    erl_internal:bif(F, A);
-is_auto_import(_) ->
-    false.
+    erl_internal:bif(F, A).
 
 timestamp() ->
     {{Yr, Mth, Dy}, {Hr, Mt, Sc}} = erlang:localtime(),