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, 4 insertions, 3 deletions

diff --git a/lib/stdlib/test/filelib_SUITE.erl b/lib/stdlib/test/filelib_SUITE.erl
index a355097fe2..dc4563967c 100644
--- a/lib/stdlib/test/filelib_SUITE.erl
+++ b/lib/stdlib/test/filelib_SUITE.erl
@@ -97,11 +97,12 @@ wildcard_errors(Config) when is_list(Config) ->
 
 wcc(Wc, Error) ->
     {'EXIT',{{badpattern,Error},
-	     [{filelib,compile_wildcard,1}|_]}} = (catch filelib:compile_wildcard(Wc)),
+	     [{filelib,compile_wildcard,1,_}|_]}} =
+	(catch filelib:compile_wildcard(Wc)),
     {'EXIT',{{badpattern,Error},
-	     [{filelib,wildcard,1}|_]}} = (catch filelib:wildcard(Wc)),
+	     [{filelib,wildcard,1,_}|_]}} = (catch filelib:wildcard(Wc)),
     {'EXIT',{{badpattern,Error},
-	     [{filelib,wildcard,2}|_]}} = (catch filelib:wildcard(Wc, ".")).
+	     [{filelib,wildcard,2,_}|_]}} = (catch filelib:wildcard(Wc, ".")).
 
 do_wildcard_1(Dir, Wcf0) ->
     do_wildcard_2(Dir, Wcf0),