A Dialyzer failure I have observed on R16B03 OSX 10.9

gistfile1.txt

— To reproduce:

# Clone repository and force a specific version
; git clone https://github.com/jlouis/msgpack-erlang.git
; cd msgpack-erlang
; git checkout origin/dialyzer-failure
; make
; make build_plt # Takes about 2 minutes
; make dialyzer

Yes I admit that my code is somewhat broken :'(

Anyway I'll try some fix later > msgpack/msgpack-erlang#26

R16B03 on FreeBSD 10.0-RELEASE:

kenji@wellmax[1001]% make dialyzer
==> msgpack-erlang (compile)
==> msgpack-erlang (xref)

Use 'make check_plt' to check PLT prior to using this target.
Use 'make build_plt' to build PLT prior to using this target.

dialyzer -Wno_return --plt /home/kenji/.msgpack_dialyzer_plt ebin
  Checking whether the PLT /home/kenji/.msgpack_dialyzer_plt is up-to-date... yes
  Proceeding with analysis...
=ERROR REPORT==== 17-Jan-2014::12:40:50 ===
Error in process <0.67.0> with exit value: {function_clause,[{erl_types,unify_lists,[[{c,tuple,[{c,atom,[ext],unknown},{c,atom,[msgpack_term],unknown}],{2,{c,atom,[ext],unknown}}}],[],[],[{c,tuple,[{c,atom,[enable_str],unknown},{c,atom,[true],unknown}],{2,{c,atom...


dialyzer: Analysis failed with error:
{function_clause,[{erl_types,unify_lists,
                             [[{c,tuple,[...],...}],[],[],[{...}|...],[]],
                             [{file,"erl_types.erl"},{line,2695}]},
                  {erl_types,t_unify,4,[{file,[...]},{line,...}]},
                  {erl_types,t_unify,4,[{file,...},{...}]},
                  {erl_types,t_unify,3,[{...}|...]},
                  {dialyzer_typesig,solve_subtype,4,[...]},
                  {dialyzer_typesig,mk_constraint,3,...},
                  {dialyzer_typesig,state__store_conj,...},
                  {dialyzer_typesig,...}]}
Last messages in the log cache:
  Reading files and computing callgraph... done in 0.27 secs
  Removing edges... done in 0.05 secs
*** Error code 1

Stop.
make: stopped in /home/kenji/src/msgpack-erlang

Same error on R15B03 (Dialyzer 2.5.3), OSX 10.8.5:

dialyzer -Wno_return --plt /Users/magnus/.msgpack_dialyzer_plt ebin
  Checking whether the PLT /Users/magnus/.msgpack_dialyzer_plt is up-to-date... yes
  Proceeding with analysis...
=ERROR REPORT==== 17-Jan-2014::15:05:30 ===
Error in process <0.76.0> with exit value: {function_clause,[{erl_types,unify_lists,[[{c,tuple,[{c,atom,[ext],unknown},{c,atom,[msgpack_term],unknown}],{2,{c,atom,[ext],unknown}}}],[],[],[{c,tuple,[{c,atom,[enable_str],unknown},{c,atom,[true],unknown}],{2,{c,atom... 


dialyzer: Analysis failed with error:
{function_clause,[{erl_types,unify_lists,
                             [[{c,tuple,[...],...}],[],[],[{...}|...],[]],
                             [{file,"erl_types.erl"},{line,2732}]},
                  {erl_types,t_unify,4,[{file,[...]},{line,...}]},
                  {erl_types,t_unify,4,[{file,...},{...}]},
                  {erl_types,t_unify,3,[{...}|...]},
                  {dialyzer_typesig,solve_subtype,4,[...]},
                  {dialyzer_typesig,mk_constraint,3,...},
                  {dialyzer_typesig,state__store_conj,...},
                  {dialyzer_typesig,...}]}
Last messages in the log cache:
  Reading files and computing callgraph... done in 0.29 secs
  Removing edges... done in 0.02 secs
make: *** [dialyzer] Error 1

Likewise on R13B04, though I needed this patch to make it compile:

diff --git a/src/msgpack.erl b/src/msgpack.erl
index 7e16581..1fad597 100644
--- a/src/msgpack.erl
+++ b/src/msgpack.erl
@@ -139,8 +139,8 @@ parse_options([{enable_str,Bool}|TL], Opt0) ->
     Opt = Opt0?OPTION{enable_str=Bool},
     parse_options(TL, Opt);
 parse_options([{ext, Module}|TL], Opt0) when is_atom(Module) ->
-    Opt = Opt0?OPTION{ext_packer=fun Module:pack_ext/2,
-                      ext_unpacker=fun Module:unpack_ext/3},
+    Opt = Opt0?OPTION{ext_packer={Module, pack_ext, 2},
+                      ext_unpacker={Module, unpack_ext, 3}},
     parse_options(TL, Opt);
 parse_options([{ext, {Packer,Unpacker}}|TL], Opt0) when
       is_function(Packer, 2) andalso

dialyzer -Wno_return --plt /Users/magnus/.msgpack_dialyzer_plt ebin
  Checking whether the PLT /Users/magnus/.msgpack_dialyzer_plt is up-to-date... yes
  Proceeding with analysis...
=ERROR REPORT==== 17-Jan-2014::15:26:55 ===
Error in process <0.30.0> with exit value: {function_clause,[{erl_types,unify_lists,[[{c,tuple,[{c,atom,[ext],unknown},{c,atom,[msgpack_term],unknown}],{2,{c,atom,[ext],unknown}}}],[],{dict,0,16,16,8,80,48,{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},{{[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]}}},[{c,tuple,[{c,atom,[enable_str... 


dialyzer: Analysis failed with error: {function_clause,[{erl_types,unify_lists,
                             [[{c,tuple,[...],...}],
                              [],
                              {dict,0,...},
                              [{...}|...],
                              []]},
                  {erl_types,t_unify,4},
                  {erl_types,t_unify,4},
                  {erl_types,t_unify,3}]}
Last messages in the log cache:
  Typesig analysis for SCC: [{msgpack,module_info,0}]
  Typesig analysis for SCC: [{msgpack,module_info,1}]
  Typesig analysis for SCC: [{msgpack,parse_options,1}]
  Typesig analysis for SCC: [{msgpack,pack,2}]
  Typesig analysis for SCC: [{msgpack,unpack_stream,2}]
  Typesig analysis for SCC: [{msgpack,unpack_stream,1}]
  Typesig analysis for SCC: [{msgpack,unpack,2}]
  Typesig analysis for SCC: [{msgpack,pack,1}]
  Typesig analysis for SCC: [{msgpack,unpack,1}]
  Typesig analysis for SCC: [{msgpack_term,to_binary,1}]
make: *** [dialyzer] Error 1

As seancribbs wrote, the culprit is that the type passed to msgpack:parse_options/1,2 is a list which includes the tuple {ext, Module::module()} but this tuple is not part ofmsgpack_list_options(). So either this type should be added to the definition, or taken out from the call.

But yes, dialyzer should not crash and this will be fixed (partial fix to be sent to erlang-bugs). Thanks for reporting this.