emulator: Add a fourth element in exception stacktraces

This commit is a preparation for introducing location information
(filename/line number) in stacktraces in exceptions. Currently
a stack trace looks like:

  [{Mod1,Function1,Arity1},
   .
   .
   .
   {ModN,FunctionN,ArityN}]

Add a forth element to each tuple that can be used indication
the filename and line number of the source file:

  [{Mod1,Function1,Arity1,Location1},
   .
   .
   .
   {ModN,FunctionN,ArityN,LocationN}]

In this commit, the fourth element will just be an empty list,
and we will change all code that look at or manipulate stacktraces.

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/stdlib/src/gen_server.erl b/lib/stdlib/src/gen_server.erl
index 09d94a9c40..b8ea3a4de2 100644
--- a/lib/stdlib/src/gen_server.erl
+++ b/lib/stdlib/src/gen_server.erl
@@ -729,16 +729,16 @@ error_info(_Reason, application_controller, _Msg, _State, _Debug) ->
 error_info(Reason, Name, Msg, State, Debug) ->
     Reason1 = 
 	case Reason of
-	    {undef,[{M,F,A}|MFAs]} ->
+	    {undef,[{M,F,A,L}|MFAs]} ->
 		case code:is_loaded(M) of
 		    false ->
-			{'module could not be loaded',[{M,F,A}|MFAs]};
+			{'module could not be loaded',[{M,F,A,L}|MFAs]};
 		    _ ->
 			case erlang:function_exported(M, F, length(A)) of
 			    true ->
 				Reason;
 			    false ->
-				{'function not exported',[{M,F,A}|MFAs]}
+				{'function not exported',[{M,F,A,L}|MFAs]}
 			end
 		end;
 	    _ ->