[dialyzer] Fix handling of literal records

This ticket is about records in Erlang code, and when to check the
fields against the (optional) types given when defining records.

Dialyzer operates on the Erlang Core format, where there are no trace
of records. The fix implemented is a Real Hack:

Given the new option 'dialyzer' erl_expand_records marks the line
number of records in a way that is undone by v3_core, which in turn
inserts annotations that can be recognized by Dialyzer.

15 files changed, 151 insertions, 28 deletions

diff --git a/lib/dialyzer/test/opaque_SUITE_data/results/simple b/lib/dialyzer/test/opaque_SUITE_data/results/simple
index 072ac9be8f..29864d6065 100644
--- a/lib/dialyzer/test/opaque_SUITE_data/results/simple
+++ b/lib/dialyzer/test/opaque_SUITE_data/results/simple
@@ -14,12 +14,17 @@ is_rec.erl:53: The call erlang:is_record(A::simple1_adt:d1(),A::simple1_adt:d1()
 is_rec.erl:57: Guard test is_record(A::simple1_adt:d1(),'r',2) breaks the opaqueness of its argument
 is_rec.erl:61: The record #r{f1::simple1_adt:d1()} violates the declared type for #r{}
 is_rec.erl:65: The call erlang:is_record({simple1_adt:d1(),1},'r',2) contains an opaque term as 1st argument when terms of different types are expected in these positions
-rec_api.erl:22: Record construction #r1{f1::10} violates the declared type of field f1::'undefined' | rec_api:a()
-rec_api.erl:23: The pattern {'r1', 10} violates the declared type for #r1{}
-rec_api.erl:27: The attempt to match a term of type rec_adt:r1() against the pattern {'r1', 'a'} breaks the opaqueness of the term
-rec_api.erl:29: Invalid type specification for function rec_api:adt_t1/1. The success typing is (#r1{f1::'a'}) -> #r1{f1::'a'}
-rec_api.erl:34: Invalid type specification for function rec_api:adt_r1/0. The success typing is () -> #r1{f1::'a'}
-rec_api.erl:77: The attempt to match a term of type rec_api:f() against the variable _ breaks the opaqueness of the term
+rec_api.erl:104: Matching of pattern {'r2', 10} tagged with a record name violates the declared type of #r2{f1::10}
+rec_api.erl:113: The attempt to match a term of type #r3{f1::queue:queue(_)} against the pattern {'r3', 'a'} breaks the opaqueness of queue:queue(_)
+rec_api.erl:118: Record construction #r3{f1::10} violates the declared type of field f1::queue:queue(_)
+rec_api.erl:123: The attempt to match a term of type #r3{f1::10} against the pattern {'r3', 10} breaks the opaqueness of queue:queue(_)
+rec_api.erl:24: Record construction #r1{f1::10} violates the declared type of field f1::'undefined' | rec_api:a()
+rec_api.erl:29: Matching of pattern {'r1', 10} tagged with a record name violates the declared type of #r1{f1::10}
+rec_api.erl:33: The attempt to match a term of type rec_adt:r1() against the pattern {'r1', 'a'} breaks the opaqueness of the term
+rec_api.erl:35: Invalid type specification for function rec_api:adt_t1/1. The success typing is (#r1{f1::'a'}) -> #r1{f1::'a'}
+rec_api.erl:40: Invalid type specification for function rec_api:adt_r1/0. The success typing is () -> #r1{f1::'a'}
+rec_api.erl:85: The attempt to match a term of type rec_api:f() against the variable _ breaks the opaqueness of rec_adt:f()
+rec_api.erl:99: Record construction #r2{f1::10} violates the declared type of field f1::rec_api:a()
 simple1_api.erl:113: The test simple1_api:d1() =:= simple1_api:d2() can never evaluate to 'true'
 simple1_api.erl:118: Guard test simple1_api:d2() =:= A::simple1_api:d1() can never succeed
 simple1_api.erl:142: Attempt to test for equality between a term of type simple1_adt:o2() and a term of opaque type simple1_adt:o1()
@@ -58,7 +63,7 @@ simple1_api.erl:381: Invalid type specification for function simple1_api:bool_ad
 simple1_api.erl:407: The size simple1_adt:i1() breaks the opaqueness of A
 simple1_api.erl:418: The attempt to match a term of type non_neg_integer() against the variable A breaks the opaqueness of simple1_adt:i1()
 simple1_api.erl:425: The attempt to match a term of type non_neg_integer() against the variable B breaks the opaqueness of simple1_adt:i1()
-simple1_api.erl:432: The attempt to match a term of type non_neg_integer() against the variable B breaks the opaqueness of simple1_api:o1()
+simple1_api.erl:432: The pattern <<_:B/integer-unit:1>> can never match the type any()
 simple1_api.erl:448: The attempt to match a term of type non_neg_integer() against the variable Sz breaks the opaqueness of simple1_adt:i1()
 simple1_api.erl:460: The attempt to match a term of type simple1_adt:bit1() against the pattern <<_/binary-unit:8>> breaks the opaqueness of the term
 simple1_api.erl:478: The call 'foo':A(A::simple1_adt:a()) breaks the opaqueness of the term A :: simple1_adt:a()
diff --git a/lib/dialyzer/test/opaque_SUITE_data/results/timer b/lib/dialyzer/test/opaque_SUITE_data/results/timer
index e917b76b08..b1cfcd4e9f 100644
--- a/lib/dialyzer/test/opaque_SUITE_data/results/timer
+++ b/lib/dialyzer/test/opaque_SUITE_data/results/timer
@@ -1,4 +1,4 @@
 
 timer_use.erl:16: The pattern 'gazonk' can never match the type {'error',_} | {'ok',timer:tref()}
-timer_use.erl:17: The attempt to match a term of type {'ok',timer:tref()} against the pattern {'ok', 42} breaks the opaqueness of timer:tref()
+timer_use.erl:17: The attempt to match a term of type {'error',_} | {'ok',timer:tref()} against the pattern {'ok', 42} breaks the opaqueness of timer:tref()
 timer_use.erl:18: The attempt to match a term of type {'error',_} | {'ok',timer:tref()} against the pattern {Tag, 'gazonk'} breaks the opaqueness of timer:tref()
diff --git a/lib/dialyzer/test/opaque_SUITE_data/src/simple/rec_api.erl b/lib/dialyzer/test/opaque_SUITE_data/src/simple/rec_api.erl
index d9b1d59f0c..fb6d59d263 100644
--- a/lib/dialyzer/test/opaque_SUITE_data/src/simple/rec_api.erl
+++ b/lib/dialyzer/test/opaque_SUITE_data/src/simple/rec_api.erl
@@ -1,9 +1,9 @@
 -module(rec_api).
 
--export([t1/0, t2/0, adt_t1/0, adt_t1/1, adt_r1/0,
-         t/1, t_adt/0, r/0, r_adt/0]).
+-export([t1/0, t2/0, t3/0, adt_t1/0, adt_t1/1, adt_r1/0,
+         t/1, t_adt/0, r/0, r_adt/0, u1/0, u2/0, u3/0, v1/0, v2/0, v3/0]).
 
--export_type([{a,0},{r1,0}]).
+-export_type([{a,0},{r1,0}, r2/0, r3/0]).
 
 -export_type([f/0, op_t/0, r/0, tup/0]).
 
@@ -19,8 +19,14 @@ t1() ->
     {r1, a} = A.
 
 t2() ->
-    A = {r1, 10}, % violates the type of #r1{}
-    {r1, 10} = A. % violates the type of #r1{}
+    A = {r1, 10},
+    {r1, 10} = A,
+    A = #r1{f1 = 10}, % violates the type of field f1
+    #r1{f1 = 10} = A.
+
+t3() ->
+    A = {r1, 10},
+    #r1{f1 = 10} = A. % violates the type of #r1{}
 
 adt_t1() ->
     R = rec_adt:r1(),
@@ -66,7 +72,8 @@ t_adt() ->
 -spec r() -> _.
 
 r() ->
-    {r, f(), 2}. % OK, f() is a local opaque type
+    {{r, f(), 2},
+     #r{f = f(), o = 2}}. % OK, f() is a local opaque type
 
 -spec f() -> f().
 
@@ -74,4 +81,43 @@ f() ->
     fun(_) -> 3 end.
 
 r_adt() ->
-    {r, rec_adt:f(), 2}. % breaks the opaqueness
+    {{r, rec_adt:f(), 2},
+     #r{f = rec_adt:f(), o = 2}}. % breaks the opaqueness
+
+-record(r2, % like #r1{}, but with initial value
+        {f1 = a :: a()}).
+
+-opaque r2() :: #r2{}.
+
+u1() ->
+    A = #r2{f1 = a},
+    {r2, a} = A.
+
+u2() ->
+    A = {r2, 10},
+    {r2, 10} = A,
+    A = #r2{f1 = 10}, % violates the type of field f1
+    #r2{f1 = 10} = A.
+
+u3() ->
+    A = {r2, 10},
+    #r2{f1 = 10} = A. % violates the type of #r2{}
+
+-record(r3, % like #r1{}, but an opaque type
+        {f1 = queue:new():: queue:queue()}).
+
+-opaque r3() :: #r3{}.
+
+v1() ->
+    A = #r3{f1 = queue:new()},
+    {r3, a} = A. % breaks the opaqueness
+
+v2() ->
+    A = {r3, 10},
+    {r3, 10} = A,
+    A = #r3{f1 = 10}, % violates the type of field f1
+    #r3{f1 = 10} = A.
+
+v3() ->
+    A = {r3, 10},
+    #r3{f1 = 10} = A. % breaks the opaqueness
diff --git a/lib/dialyzer/test/opaque_SUITE_data/src/simple/simple1_api.erl b/lib/dialyzer/test/opaque_SUITE_data/src/simple/simple1_api.erl
index 5135eb8e59..eef2074e0c 100644
--- a/lib/dialyzer/test/opaque_SUITE_data/src/simple/simple1_api.erl
+++ b/lib/dialyzer/test/opaque_SUITE_data/src/simple/simple1_api.erl
@@ -428,8 +428,8 @@ bit_adt_t3(A) ->
 
 bit_t5(A) ->
     B = o1(),
-    case none:none() of
-        <<A:B>> -> 1 % breaks the opaqueness
+    case none:none() of % the type is any(); should fix that XXX
+        <<A:B>> -> 1 % can never match (local opaque type is OK)
     end.
 
 -spec bit_t4(<<_:1>>) -> integer().
diff --git a/lib/dialyzer/test/options1_SUITE_data/results/compiler b/lib/dialyzer/test/options1_SUITE_data/results/compiler
index 6399e3e36b..30b6f4814a 100644
--- a/lib/dialyzer/test/options1_SUITE_data/results/compiler
+++ b/lib/dialyzer/test/options1_SUITE_data/results/compiler
@@ -4,7 +4,7 @@ beam_bool.erl:193: The pattern {[], _} can never match the type {[{_,_,_,_},...]
 beam_bool.erl:510: The pattern [{'set', [Dst], _, _}, {'%live', _}] can never match the type [{_,_,_,_}]
 beam_disasm.erl:537: The variable X can never match since previous clauses completely covered the type 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
 beam_type.erl:284: The pattern <'pi', 0> can never match the type <_,1 | 2>
-beam_validator.erl:396: The pattern <{'jump', {'f', _}}, Vst = {'vst', 'none', _}> can never match the type <_,#vst{current::#st{ct::[]}}>
+beam_validator.erl:396: Matching of pattern {'vst', 'none', _} tagged with a record name violates the declared type of #vst{current::#st{ct::[]}}
 beam_validator.erl:690: The pattern <'term', OldT> can never match the type <{'tuple',[any(),...]},_>
 beam_validator.erl:693: Guard test 'or'('false','false') can never succeed
 beam_validator.erl:700: Guard test 'or'('false','false') can never succeed
@@ -33,4 +33,4 @@ core_lint.erl:473: The pattern <{'c_atom', _, 'all'}, 'binary', _Def, St> can ne
 core_lint.erl:505: The pattern <_Req, 'unknown', St> can never match the type <non_neg_integer(),non_neg_integer(),_>
 v3_codegen.erl:1569: The call v3_codegen:load_reg_1(V::any(),I::0,Rs::any(),pos_integer()) will never return since it differs in the 4th argument from the success typing arguments: (any(),0,maybe_improper_list(),0)
 v3_codegen.erl:1571: The call v3_codegen:load_reg_1(V::any(),I::0,[],pos_integer()) will never return since it differs in the 4th argument from the success typing arguments: (any(),0,maybe_improper_list(),0)
-v3_core.erl:646: The pattern <Prim = {'iprimop', _, _, _}, St> can never match the type <#c_nil{anno::[any(),...]} | {'c_atom' | 'c_char' | 'c_float' | 'c_int' | 'c_string' | 'c_tuple' | 'c_var' | 'ibinary' | 'icatch' | 'ireceive1',[any(),...] | {_,_,_,_},_} | #c_cons{anno::[any(),...]} | #c_fname{anno::[any(),...]} | #iletrec{anno::{_,_,_,_},defs::[any(),...],body::[any(),...]} | #icase{anno::{_,_,_,_},args::[any()],clauses::[any()],fc::{_,_,_,_,_,_}} | #ireceive2{anno::{_,_,_,_},clauses::[any()],action::[any()]} | #ifun{anno::{_,_,_,_},id::[any(),...],vars::[any()],clauses::[any(),...],fc::{_,_,_,_,_,_}} | #imatch{anno::{_,_,_,_},guard::[],fc::{_,_,_,_,_,_}} | #itry{anno::{_,_,_,_},args::[any()],vars::[any(),...],body::[any(),...],evars::[any(),...],handler::[any(),...]},_>
+v3_core.erl:646: Matching of pattern {'iprimop', _, _, _} tagged with a record name violates the declared type of #c_nil{anno::[any(),...]} | {'c_atom' | 'c_char' | 'c_float' | 'c_int' | 'c_string' | 'c_tuple' | 'c_var' | 'ibinary' | 'icatch' | 'ireceive1',[any(),...] | {_,_,_,_},_} | #c_cons{anno::[any(),...]} | #c_fname{anno::[any(),...]} | #iletrec{anno::{_,_,_,_},defs::[any(),...],body::[any(),...]} | #icase{anno::{_,_,_,_},args::[any()],clauses::[any()],fc::{_,_,_,_,_,_}} | #ireceive2{anno::{_,_,_,_},clauses::[any()],action::[any()]} | #ifun{anno::{_,_,_,_},id::[any(),...],vars::[any()],clauses::[any(),...],fc::{_,_,_,_,_,_}} | #imatch{anno::{_,_,_,_},guard::[],fc::{_,_,_,_,_,_}} | #itry{anno::{_,_,_,_},args::[any()],vars::[any(),...],body::[any(),...],evars::[any(),...],handler::[any(),...]}
diff --git a/lib/dialyzer/test/r9c_SUITE_data/results/asn1 b/lib/dialyzer/test/r9c_SUITE_data/results/asn1
index c11105b76d..1cf03346ee 100644
--- a/lib/dialyzer/test/r9c_SUITE_data/results/asn1
+++ b/lib/dialyzer/test/r9c_SUITE_data/results/asn1
@@ -5,7 +5,7 @@ asn1ct.erl:1673: The pattern 'all' can never match the type 'asn1_module' | 'exc
 asn1ct.erl:672: The pattern <{'false', Result}, _, _> can never match the type <{'true','true'},atom() | binary() | [atom() | [any()] | char()],[any()]>
 asn1ct.erl:909: Guard test is_atom(Ext::[49 | 97 | 98 | 100 | 110 | 115]) can never succeed
 asn1ct_check.erl:1698: The pattern {'error', _} can never match the type [any()]
-asn1ct_check.erl:2733: The pattern {'type', Tag, _, _, _, _} can never match the type 'ASN1_OPEN_TYPE' | {_,_} | {'fixedtypevaluefield',_,_}
+asn1ct_check.erl:2733: Matching of pattern {'type', Tag, _, _, _, _} tagged with a record name violates the declared type of 'ASN1_OPEN_TYPE' | {_,_} | {'fixedtypevaluefield',_,_}
 asn1ct_check.erl:2738: The pattern <_S, _> can never match since previous clauses completely covered the type <#state{},#'ObjectClassFieldType'{class::#objectclass{fields::maybe_improper_list() | {_,_,_,_}},fieldname::{_,maybe_improper_list()},type::'ASN1_OPEN_TYPE' | {_,_} | {'fixedtypevaluefield',_,_}}>
 asn1ct_check.erl:2887: The variable Other can never match since previous clauses completely covered the type any()
 asn1ct_check.erl:3188: The pattern <_S, [], B> can never match the type <#state{},{'SingleValue',_},{'ValueRange',_}>
diff --git a/lib/dialyzer/test/small_SUITE_data/results/confusing_record_warning b/lib/dialyzer/test/small_SUITE_data/results/confusing_record_warning
deleted file mode 100644
index ac3d89b02b..0000000000
--- a/lib/dialyzer/test/small_SUITE_data/results/confusing_record_warning
+++ /dev/null
@@ -1,3 +0,0 @@
-
-confusing_record_warning.erl:18: Function test/1 has no local return
-confusing_record_warning.erl:18: Matching of pattern {'r', [_]} tagged with a record name violates the declared type of #r{field::'binary' | 'undefined'}
diff --git a/lib/dialyzer/test/small_SUITE_data/results/literals b/lib/dialyzer/test/small_SUITE_data/results/literals
new file mode 100644
index 0000000000..03e161ca71
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/results/literals
@@ -0,0 +1,14 @@
+
+literals.erl:11: Function t1/0 has no local return
+literals.erl:12: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:14: Function t2/0 has no local return
+literals.erl:15: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:17: Function t3/0 has no local return
+literals.erl:18: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:21: Record construction #r{id::'a'} violates the declared type of field id::'integer' | 'undefined'
+literals.erl:23: Function m1/1 has no local return
+literals.erl:23: Matching of pattern {'r', 'a'} tagged with a record name violates the declared type of #r{id::'integer' | 'undefined'}
+literals.erl:26: Function m2/1 has no local return
+literals.erl:26: Matching of pattern {'r', 'a'} tagged with a record name violates the declared type of #r{id::'integer' | 'undefined'}
+literals.erl:29: Function m3/1 has no local return
+literals.erl:29: The pattern {{'r', 'a'}} can never match the type any()
diff --git a/lib/dialyzer/test/small_SUITE_data/results/my_sofs b/lib/dialyzer/test/small_SUITE_data/results/my_sofs
index bc97c08d62..0b933e6cd7 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/my_sofs
+++ b/lib/dialyzer/test/small_SUITE_data/results/my_sofs
@@ -1,3 +1,3 @@
 
-my_sofs.erl:34: The pattern {'Set', _, _} can never match the type #'OrdSet'{}
-my_sofs.erl:54: The pattern {'Set', _, _} can never match the type #'OrdSet'{}
+my_sofs.erl:34: Matching of pattern {'Set', _, _} tagged with a record name violates the declared type of #'OrdSet'{}
+my_sofs.erl:54: Matching of pattern {'Set', _, _} tagged with a record name violates the declared type of #'OrdSet'{}
diff --git a/lib/dialyzer/test/small_SUITE_data/results/record_pat b/lib/dialyzer/test/small_SUITE_data/results/record_pat
index 9a3f925e42..a46be6c451 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/record_pat
+++ b/lib/dialyzer/test/small_SUITE_data/results/record_pat
@@ -1,2 +1,2 @@
 
-record_pat.erl:14: The pattern {'foo', 'baz'} violates the declared type for #foo{}
+record_pat.erl:14: Matching of pattern {'foo', 'baz'} tagged with a record name violates the declared type of #foo{bar::'undefined' | integer()}
diff --git a/lib/dialyzer/test/small_SUITE_data/results/record_test b/lib/dialyzer/test/small_SUITE_data/results/record_test
index 9715f0dcfb..7060bfa200 100644
--- a/lib/dialyzer/test/small_SUITE_data/results/record_test
+++ b/lib/dialyzer/test/small_SUITE_data/results/record_test
@@ -1,3 +1,3 @@
 
-record_test.erl:19: The pattern {'foo', _} can never match the type 'foo'
+record_test.erl:19: Matching of pattern {'foo', _} tagged with a record name violates the declared type of 'foo'
 record_test.erl:21: The variable _ can never match since previous clauses completely covered the type 'foo'
diff --git a/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning b/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning
new file mode 100644
index 0000000000..2e417e1b2a
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/results/relevant_record_warning
@@ -0,0 +1,3 @@
+
+relevant_record_warning.erl:22: Function test/1 has no local return
+relevant_record_warning.erl:23: Record construction #r{field::<<_:8>>} violates the declared type of field field::'binary' | 'undefined'
diff --git a/lib/dialyzer/test/small_SUITE_data/src/fun2ms.erl b/lib/dialyzer/test/small_SUITE_data/src/fun2ms.erl
new file mode 100644
index 0000000000..9e7df85e4c
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/fun2ms.erl
@@ -0,0 +1,21 @@
+-module(fun2ms).
+-export([return/0]).
+-include_lib("stdlib/include/ms_transform.hrl").
+
+-record(snapshot, {id :: integer(), arg1 :: atom(), arg2 :: tuple()}).
+
+return() ->
+    TableId = ets:new(table, [public, {keypos, #snapshot.id}]),
+
+    ets:insert(TableId, [#snapshot{id = 1, arg1 = hard, arg2 = {1,2}},
+                         #snapshot{id = 2, arg1 = rock, arg2 = {1,2}},
+                         #snapshot{id = 3, arg1 = hallelujah, arg2 =
+                                       {1,2}}]),
+
+
+    Example = ets:fun2ms(
+                fun(#snapshot{id = Arg1, arg1 = Arg2}) ->
+                        {Arg1, Arg2}
+                end),
+
+    ets:select(TableId, Example).
diff --git a/lib/dialyzer/test/small_SUITE_data/src/literals.erl b/lib/dialyzer/test/small_SUITE_data/src/literals.erl
new file mode 100644
index 0000000000..abd7033712
--- /dev/null
+++ b/lib/dialyzer/test/small_SUITE_data/src/literals.erl
@@ -0,0 +1,33 @@
+-module(literals).
+
+%% Bad records inside structures used to be ignored. The reason:
+%% v3_core:unfold() does not annotate the parts of a literal.
+%% This example does not work perfectly yet, in particular Maps.
+
+-export([t1/0, t2/0, t3/0, t4/0, m1/1, m2/1, m3/1, m4/1]).
+
+-record(r, {id :: integer}).
+
+t1() ->
+    #r{id = a}. % violation
+
+t2() ->
+    [#r{id = a}]. % violation
+
+t3() ->
+    {#r{id = a}}. % violation
+
+t4() ->
+    #{a => #r{id = a}}. % violation found, but t4() returns... (bug)
+
+m1(#r{id = a}) -> % violation
+    ok.
+
+m2([#r{id = a}]) -> % violation
+    ok.
+
+m3({#r{id = a}}) -> % can never match; not so good
+    ok.
+
+m4(#{a := #r{id = a}}) -> % violation not found
+    ok.
diff --git a/lib/dialyzer/test/small_SUITE_data/src/confusing_record_warning.erl b/lib/dialyzer/test/small_SUITE_data/src/relevant_record_warning.erl
index 8af74e0914..3ff65458df 100644
--- a/lib/dialyzer/test/small_SUITE_data/src/confusing_record_warning.erl
+++ b/lib/dialyzer/test/small_SUITE_data/src/relevant_record_warning.erl
@@ -1,3 +1,7 @@
+%% Formerly confusing_record_warning.erl.
+%% The warning output is relevant as of Erlang/OTP 17.1.
+%% The original comment kept below.
+
 %%---------------------------------------------------------------------
 %% A user complained that dialyzer produces a weird warning for the
 %% following program.  I explained to him that there is an implicit
@@ -9,7 +13,7 @@
 %%    The pattern {'r', [_]} can never match the type any()
 %% We should clearly give some less confusing warning in this case.
 %%---------------------------------------------------------------------
--module(confusing_record_warning).
+-module(relevant_record_warning).
 
 -export([test/1]).