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/test/sofs_SUITE.erl b/lib/stdlib/test/sofs_SUITE.erl
index d6f88a655e..73b282149a 100644
--- a/lib/stdlib/test/sofs_SUITE.erl
+++ b/lib/stdlib/test/sofs_SUITE.erl
@@ -1879,11 +1879,11 @@ digraph(Conf) when is_list(Conf) ->
 
     ?line {'EXIT', {badarg, _}} = 
         (catch family_to_digraph(set([a]))),
-    ?line {'EXIT', {badarg, [{sofs,family_to_digraph,[_,_]}|_]}} =
+    ?line {'EXIT', {badarg, [{sofs,family_to_digraph,[_,_],_}|_]}} =
         (catch family_to_digraph(set([a]), [foo])),
-    ?line {'EXIT', {badarg, [{sofs,family_to_digraph,[_,_]}|_]}} =
+    ?line {'EXIT', {badarg, [{sofs,family_to_digraph,[_,_],_}|_]}} =
         (catch family_to_digraph(F, [foo])),
-    ?line {'EXIT', {cyclic, [{sofs,family_to_digraph,[_,_]}|_]}} =
+    ?line {'EXIT', {cyclic, [{sofs,family_to_digraph,[_,_],_}|_]}} =
         (catch family_to_digraph(family([{a,[a]}]),[acyclic])),
 
     ?line G1 = family_to_digraph(E),