dialyzer: Do not output warnings for unused funs

Dialyzer no longer outputs warnings for unused anonymous functions
("funs"). Warnings are still output for unused functions.

Funs in functions with -nowarn_unused_function attributes generated
warnings for unused functions. Unused list comprehensions also
generated warnings for unused funs.

4 files changed, 2 insertions, 10 deletions

diff --git a/lib/dialyzer/src/dialyzer.erl b/lib/dialyzer/src/dialyzer.erl
index 3e3c12405f..d875c45c4a 100644
--- a/lib/dialyzer/src/dialyzer.erl
+++ b/lib/dialyzer/src/dialyzer.erl
@@ -2,7 +2,7 @@
 %%-----------------------------------------------------------------------
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2006-2011. All Rights Reserved.
+%% Copyright Ericsson AB 2006-2012. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -380,8 +380,6 @@ message_to_string({pattern_match_cov, [Pat, Type]}) ->
 message_to_string({unmatched_return, [Type]}) ->
   io_lib:format("Expression produces a value of type ~s,"
 		" but this value is unmatched\n", [Type]);
-message_to_string({unused_fun, []}) ->
-  io_lib:format("Function will never be called\n", []);
 message_to_string({unused_fun, [F, A]}) ->
   io_lib:format("Function ~w/~w will never be called\n", [F, A]);
 %%----- Warnings for specs and contracts -------------------
diff --git a/lib/dialyzer/src/dialyzer_dataflow.erl b/lib/dialyzer/src/dialyzer_dataflow.erl
index 7131633da1..f40bb2d395 100644
--- a/lib/dialyzer/src/dialyzer_dataflow.erl
+++ b/lib/dialyzer/src/dialyzer_dataflow.erl
@@ -2806,7 +2806,7 @@ state__get_warnings(#state{tree_map = TreeMap, fun_tab = FunTab,
 	  true ->
 	    {Warn, Msg} =
 	      case dialyzer_callgraph:lookup_name(FunLbl, Callgraph) of
-		error -> {true, {unused_fun, []}};
+		error -> {false, {}};
 		{ok, {_M, F, A} = MFA} ->
 		  {not sets:is_element(MFA, NoWarnUnused),
 		   {unused_fun, [F, A]}}
diff --git a/lib/dialyzer/test/r9c_SUITE_data/results/asn1 b/lib/dialyzer/test/r9c_SUITE_data/results/asn1
index 292275dd6e..c11105b76d 100644
--- a/lib/dialyzer/test/r9c_SUITE_data/results/asn1
+++ b/lib/dialyzer/test/r9c_SUITE_data/results/asn1
@@ -68,7 +68,6 @@ asn1rt_check.erl:100: The variable _ can never match since previous clauses comp
 asn1rt_check.erl:85: The variable _ can never match since previous clauses completely covered the type [any()]
 asn1rt_driver_handler.erl:32: The pattern 'already_done' can never match the type {'error',_}
 asn1rt_per.erl:1065: The pattern {'BMPString', {'octets', Ol}} can never match the type {_,[{'bits',1 | 2 | 4 | 8 | 16 | 32,_}]}
-asn1rt_per.erl:1066: Function will never be called
 asn1rt_per.erl:1231: The call erlang:'not'('implemented') will never return since it differs in the 1st argument from the success typing arguments: (boolean())
 asn1rt_per.erl:1233: The call erlang:'not'('implemented') will never return since it differs in the 1st argument from the success typing arguments: (boolean())
 asn1rt_per.erl:1235: The call erlang:'not'('implemented') will never return since it differs in the 1st argument from the success typing arguments: (boolean())
@@ -76,7 +75,6 @@ asn1rt_per.erl:1237: The call erlang:'not'('implemented') will never return sinc
 asn1rt_per.erl:989: The pattern <_C, 'true', _Val> can never match the type <_,'false',_>
 asn1rt_per_bin.erl:1361: The pattern <_, 'true', _> can never match the type <_,'false',_>
 asn1rt_per_bin.erl:1436: The pattern {'BMPString', {'octets', Ol}} can never match the type {'BMPString' | 'IA5String' | 'NumericString' | 'PrintableString' | 'UniversalString' | 'VisibleString',[{'bits',1 | 2 | 4 | 8 | 16 | 32,_}]}
-asn1rt_per_bin.erl:1437: Function will never be called
 asn1rt_per_bin.erl:161: The call asn1rt_per_bin:getbit({0,maybe_improper_list()}) will never return since it differs in the 1st argument from the success typing arguments: (<<_:8,_:_*8>> | {non_neg_integer(),<<_:1,_:_*1>>})
 asn1rt_per_bin.erl:1812: The pattern {Name, Val} can never match since previous clauses completely covered the type any()
 asn1rt_per_bin.erl:2106: Cons will produce an improper list since its 2nd argument is binary()
@@ -94,7 +92,6 @@ asn1rt_per_bin.erl:487: The variable _ can never match since previous clauses co
 asn1rt_per_bin.erl:498: The variable _ can never match since previous clauses completely covered the type integer()
 asn1rt_per_bin_rt2ct.erl:152: The call asn1rt_per_bin_rt2ct:getbit({0,maybe_improper_list()}) will never return since it differs in the 1st argument from the success typing arguments: (<<_:8,_:_*8>> | {non_neg_integer(),<<_:1,_:_*1>>})
 asn1rt_per_bin_rt2ct.erl:1533: The pattern {'BMPString', {'octets', Ol}} can never match the type {_,[[any(),...]]}
-asn1rt_per_bin_rt2ct.erl:1534: Function will never be called
 asn1rt_per_bin_rt2ct.erl:1875: The pattern {Name, Val} can never match since previous clauses completely covered the type any()
 asn1rt_per_bin_rt2ct.erl:443: The variable _ can never match since previous clauses completely covered the type integer()
 asn1rt_per_bin_rt2ct.erl:464: The variable _ can never match since previous clauses completely covered the type integer()
@@ -103,4 +100,3 @@ asn1rt_per_bin_rt2ct.erl:484: The variable _ can never match since previous clau
 asn1rt_per_bin_rt2ct.erl:495: The variable _ can never match since previous clauses completely covered the type integer()
 asn1rt_per_v1.erl:1209: The pattern <_, 'true', _> can never match the type <_,'false',_>
 asn1rt_per_v1.erl:1290: The pattern {'BMPString', {'octets', Ol}} can never match the type {'BMPString' | 'IA5String' | 'NumericString' | 'PrintableString' | 'UniversalString' | 'VisibleString',[{'bits',1 | 2 | 4 | 8 | 16 | 32,_}]}
-asn1rt_per_v1.erl:1291: Function will never be called
diff --git a/lib/dialyzer/test/small_SUITE_data/results/fun_ref_match b/lib/dialyzer/test/small_SUITE_data/results/fun_ref_match
index 60b34530b4..e69de29bb2 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/fun_ref_match
+++ b/lib/dialyzer/test/small_SUITE_data/results/fun_ref_match
@@ -1,2 +0,0 @@
-
-fun_ref_match.erl:14: Function will never be called