any idea how to trace `apply/3`

[nietaki]

any idea how to trace `apply/3`

[bryanhuntesl]

Doesn't look to be a Rexbug issue - tried using redbug (underlying library) and behaviour is the same :

iex(89)> :redbug.start('erlang:apply')
{330, 2}
         
% 15:08:22 <0.841.0>({erlang,apply,2})
% erlang:apply(#Fun<Elixir.IEx.Server.0.85340651>, [])
iex(90)> :erlang.apply(:lists, :join, [",",[1,2]])
[1, ",", 2]
         
% 15:08:25 <0.843.0>({erlang,apply,2})
% erlang:apply(#Fun<Elixir.IEx.Server.0.85340651>, [])
redbug done, timeout - 2

[nietaki]

Seems to work in redbug 2.x, should work correctly in rexbug 2.x:

iex(31)> :redbug.start('erlang:apply')
{110, 2}
         
% 00:38:43 <0.407.0>({erlang,apply,2})
% erlang:apply(#Fun<Elixir.IEx.Server.0.134004696>, [])
iex(32)> :erlang.apply(:lists, :join, [",",[1,2]])
[1, ",", 2]
         
% 00:38:53 <0.408.0>({erlang,apply,2})
% erlang:apply(#Fun<Elixir.IEx.Server.0.134004696>, [])
redbug done, timeout - 2
iex(33)>

[bryanhuntesl]

Thinking it was a general issue with BIF's but :lists.reverse/1 traces fine :

iex(116)> :redbug.start('lists:reverse([1,2,3,4,5]) -> return')
{330, 1}
iex(117)> :lists.reverse([1,2,3,4,5])                          
[5, 4, 3, 2, 1]

% 15:24:42 <0.504.0>({'Elixir.IEx.Evaluator',init,4})
% lists:reverse([1,2,3,4,5])
          
% 15:24:42 <0.504.0>({'Elixir.IEx.Evaluator',init,4})
% lists:reverse/1 -> [5,4,3,2,1]