Rename suite data directories

1 files changed, 1026 insertions, 0 deletions

diff --git a/lib/dialyzer/test/options1_SUITE_data/src/compiler/sys_pre_expand.erl b/lib/dialyzer/test/options1_SUITE_data/src/compiler/sys_pre_expand.erl
new file mode 100644
index 0000000000..08bc6cb147
--- /dev/null
+++ b/lib/dialyzer/test/options1_SUITE_data/src/compiler/sys_pre_expand.erl
@@ -0,0 +1,1026 @@
+%% ``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
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved via the world wide web at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%%
+%%     $Id: sys_pre_expand.erl,v 1.1 2008/12/17 09:53:42 mikpe Exp $
+%%
+%% Purpose : Expand some source Erlang constructions. This is part of the
+%%           pre-processing phase.
+
+%% N.B. Although structs (tagged tuples) are not yet allowed in the
+%% language there is code included in pattern/2 and expr/3 (commented out)
+%% that handles them by transforming them to tuples.
+
+-module(sys_pre_expand).
+
+%% Main entry point.
+-export([module/2]).
+
+-import(ordsets, [from_list/1,add_element/2,
+		  union/1,union/2,intersection/1,intersection/2,subtract/2]).
+-import(lists,   [member/2,map/2,foldl/3,foldr/3,sort/1,reverse/1,duplicate/2]).
+
+-include("../my_include/erl_bits.hrl").
+
+-record(expand, {module=[],			%Module name
+		 parameters=undefined,		%Module parameters
+		 package="",			%Module package
+		 exports=[],			%Exports
+		 imports=[],			%Imports
+		 mod_imports,			%Module Imports
+		 compile=[],			%Compile flags
+		 records=dict:new(),		%Record definitions
+		 attributes=[],			%Attributes
+		 defined=[],			%Defined functions
+		 vcount=0,			%Variable counter
+		 func=[],			%Current function
+		 arity=[],			%Arity for current function
+		 fcount=0,			%Local fun count
+		 fun_index=0,			%Global index for funs
+		 bitdefault,
+		 bittypes
+		}).
+
+%% module(Forms, CompileOptions)
+%%	{ModuleName,Exports,TransformedForms}
+%%  Expand the forms in one module. N.B.: the lists of predefined
+%%  exports and imports are really ordsets!
+
+module(Fs, Opts) ->
+    %% Set pre-defined exported functions.
+    PreExp = [{module_info,0},{module_info,1}],
+
+    %% Set pre-defined module imports.
+    PreModImp = [{erlang,erlang},{packages,packages}],
+
+    %% Build initial expand record.
+    St0 = #expand{exports=PreExp,
+		  mod_imports=dict:from_list(PreModImp),
+		  compile=Opts,
+		  defined=PreExp,
+		  bitdefault = erl_bits:system_bitdefault(),
+		  bittypes = erl_bits:system_bittypes()
+		 },
+    %% Expand the functions.
+    {Tfs,St1} = forms(Fs, foldl(fun define_function/2, St0, Fs)),
+    {Efs,St2} = expand_pmod(Tfs, St1),
+    %% Get the correct list of exported functions.
+    Exports = case member(export_all, St2#expand.compile) of
+		  true -> St2#expand.defined;
+		  false -> St2#expand.exports
+	      end,
+    %% Generate all functions from stored info.
+    {Ats,St3} = module_attrs(St2#expand{exports = Exports}),
+    {Mfs,St4} = module_predef_funcs(St3),
+    {St4#expand.module, St4#expand.exports, Ats ++ Efs ++ Mfs,
+     St4#expand.compile}.
+
+expand_pmod(Fs0, St) ->
+    case St#expand.parameters of
+	undefined ->
+	    {Fs0,St};
+	Ps ->
+	    {Fs1,Xs,Ds} = sys_expand_pmod:forms(Fs0, Ps,
+						St#expand.exports,
+						St#expand.defined),
+	    A = length(Ps),
+	    Vs = [{var,0,V} || V <- Ps],
+	    N = {atom,0,St#expand.module},
+	    B = [{tuple,0,[N|Vs]}],
+	    F = {function,0,new,A,[{clause,0,Vs,[],B}]},
+	    As = St#expand.attributes,
+	    {[F|Fs1],St#expand{exports=add_element({new,A}, Xs),
+			       defined=add_element({new,A}, Ds),
+			       attributes = [{abstract, true} | As]}}
+    end.
+
+%% -type define_function(Form, State) -> State.
+%%  Add function to defined if form a function.
+
+define_function({function,_,N,A,_Cs}, St) ->
+    St#expand{defined=add_element({N,A}, St#expand.defined)};
+define_function(_, St) -> St.
+
+module_attrs(St) ->
+    {[{attribute,0,Name,Val} || {Name,Val} <- St#expand.attributes],St}.
+
+module_predef_funcs(St) ->
+    PreDef = [{module_info,0},{module_info,1}],
+    PreExp = PreDef,
+    {[{function,0,module_info,0,
+       [{clause,0,[],[],
+        [{call,0,{remote,0,{atom,0,erlang},{atom,0,get_module_info}},
+          [{atom,0,St#expand.module}]}]}]},
+      {function,0,module_info,1,
+       [{clause,0,[{var,0,'X'}],[],
+        [{call,0,{remote,0,{atom,0,erlang},{atom,0,get_module_info}},
+          [{atom,0,St#expand.module},{var,0,'X'}]}]}]}],
+     St#expand{defined=union(from_list(PreDef), St#expand.defined),
+	       exports=union(from_list(PreExp), St#expand.exports)}}.
+
+%% forms(Forms, State) ->
+%%	{TransformedForms,State'}
+%%  Process the forms. Attributes are lost and just affect the state.
+%%  Ignore uninteresting forms like eof and type.
+
+forms([{attribute,_,Name,Val}|Fs0], St0) ->
+    St1 = attribute(Name, Val, St0),
+    forms(Fs0, St1);
+forms([{function,L,N,A,Cs}|Fs0], St0) ->
+    {Ff,St1} = function(L, N, A, Cs, St0),
+    {Fs,St2} = forms(Fs0, St1),
+    {[Ff|Fs],St2};
+forms([_|Fs], St) -> forms(Fs, St);
+forms([], St) -> {[],St}.
+
+%% -type attribute(Attribute, Value, State) ->
+%%	State.
+%%  Process an attribute, this just affects the state.
+
+attribute(module, {Module, As}, St) ->
+    M = package_to_string(Module),
+    St#expand{module=list_to_atom(M),
+	      package = packages:strip_last(M),
+	      parameters=As};
+attribute(module, Module, St) ->
+    M = package_to_string(Module),
+    St#expand{module=list_to_atom(M),
+	      package = packages:strip_last(M)};
+attribute(export, Es, St) ->
+    St#expand{exports=union(from_list(Es), St#expand.exports)};
+attribute(import, Is, St) ->
+    import(Is, St);
+attribute(compile, C, St) when list(C) ->
+    St#expand{compile=St#expand.compile ++ C};
+attribute(compile, C, St) ->
+    St#expand{compile=St#expand.compile ++ [C]};
+attribute(record, {Name,Defs}, St) ->
+    St#expand{records=dict:store(Name, normalise_fields(Defs),
+				 St#expand.records)};
+attribute(file, _File, St) -> St;		%This is ignored
+attribute(Name, Val, St) when list(Val) ->
+    St#expand{attributes=St#expand.attributes ++ [{Name,Val}]};
+attribute(Name, Val, St) ->
+    St#expand{attributes=St#expand.attributes ++ [{Name,[Val]}]}.
+
+function(L, N, A, Cs0, St0) ->
+    {Cs,St} = clauses(Cs0, St0#expand{func=N,arity=A,fcount=0}),
+    {{function,L,N,A,Cs},St}.
+
+%% -type clauses([Clause], State) ->
+%%	{[TransformedClause],State}.
+%%  Expand function clauses.
+
+clauses([{clause,Line,H0,G0,B0}|Cs0], St0) ->
+    {H,Hvs,_Hus,St1} = head(H0, St0),
+    {G,Gvs,_Gus,St2} = guard(G0, Hvs, St1),
+    {B,_Bvs,_Bus,St3} = exprs(B0, union(Hvs, Gvs), St2),
+    {Cs,St4} = clauses(Cs0, St3),
+    {[{clause,Line,H,G,B}|Cs],St4};
+clauses([], St) -> {[],St}.
+
+%% head(HeadPatterns, State) ->
+%%	{TransformedPatterns,Variables,UsedVariables,State'}
+
+head(As, St) -> pattern_list(As, St).
+
+%% pattern(Pattern, State) ->
+%%	{TransformedPattern,Variables,UsedVariables,State'}
+%% BITS: added used variables for bit patterns with varaible length
+%%
+
+pattern({var,_,'_'}=Var, St) ->			%Ignore anonymous variable.
+    {Var,[],[],St};
+pattern({var,_,V}=Var, St) ->
+    {Var,[V],[],St};
+pattern({char,_,_}=Char, St) ->
+    {Char,[],[],St};
+pattern({integer,_,_}=Int, St) ->
+    {Int,[],[],St};
+pattern({float,_,_}=Float, St) ->
+    {Float,[],[],St};
+pattern({atom,_,_}=Atom, St) ->
+    {Atom,[],[],St};
+pattern({string,_,_}=String, St) ->
+    {String,[],[],St};
+pattern({nil,_}=Nil, St) ->
+    {Nil,[],[],St};
+pattern({cons,Line,H,T}, St0) ->
+    {TH,THvs,Hus,St1} = pattern(H, St0),
+    {TT,TTvs,Tus,St2} = pattern(T, St1),
+    {{cons,Line,TH,TT},union(THvs, TTvs),union(Hus,Tus),St2};
+pattern({tuple,Line,Ps}, St0) ->
+    {TPs,TPsvs,Tus,St1} = pattern_list(Ps, St0),
+    {{tuple,Line,TPs},TPsvs,Tus,St1};
+%%pattern({struct,Line,Tag,Ps}, St0) ->
+%%    {TPs,TPsvs,St1} = pattern_list(Ps, St0),
+%%    {{tuple,Line,[{atom,Line,Tag}|TPs]},TPsvs,St1};
+pattern({record_field,_,_,_}=M, St) ->
+    {expand_package(M, St), [], [], St};  % must be a package name
+pattern({record_index,Line,Name,Field}, St) ->
+    {index_expr(Line, Field, Name, record_fields(Name, St)),[],[],St};
+pattern({record,Line,Name,Pfs}, St0) ->
+    Fs = record_fields(Name, St0),
+    {TMs,TMsvs,Us,St1} = pattern_list(pattern_fields(Fs, Pfs), St0),
+    {{tuple,Line,[{atom,Line,Name}|TMs]},TMsvs,Us,St1};
+pattern({bin,Line,Es0}, St0) ->
+    {Es1,Esvs,Esus,St1} = pattern_bin(Es0, St0),
+    {{bin,Line,Es1},Esvs,Esus,St1};
+pattern({op,_,'++',{nil,_},R}, St) ->
+    pattern(R, St);
+pattern({op,_,'++',{cons,Li,H,T},R}, St) ->
+    pattern({cons,Li,H,{op,Li,'++',T,R}}, St);
+pattern({op,_,'++',{string,Li,L},R}, St) ->
+    pattern(string_to_conses(Li, L, R), St);
+pattern({match,Line,Pat1, Pat2}, St0) ->
+    {TH,Hvt,Hus,St1} = pattern(Pat2, St0),
+    {TT,Tvt,Tus,St2} = pattern(Pat1, St1),
+    {{match,Line,TT,TH}, union(Hvt,Tvt), union(Hus,Tus), St2};
+%% Compile-time pattern expressions, including unary operators.
+pattern({op,Line,Op,A}, St) ->
+    { erl_eval:partial_eval({op,Line,Op,A}), [], [], St};
+pattern({op,Line,Op,L,R}, St) ->
+    { erl_eval:partial_eval({op,Line,Op,L,R}), [], [], St}.
+
+pattern_list([P0|Ps0], St0) ->
+    {P,Pvs,Pus,St1} = pattern(P0, St0),
+    {Ps,Psvs,Psus,St2} = pattern_list(Ps0, St1),
+    {[P|Ps],union(Pvs, Psvs),union(Pus, Psus),St2};
+pattern_list([], St) -> {[],[],[],St}.
+
+%% guard(Guard, VisibleVariables, State) ->
+%%	{TransformedGuard,NewVariables,UsedVariables,State'}
+%%  Transform a list of guard tests. We KNOW that this has been checked
+%%  and what the guards test are. Use expr for transforming the guard
+%%  expressions.
+
+guard([G0|Gs0], Vs, St0) ->
+    {G,Hvs,Hus,St1} = guard_tests(G0, Vs, St0),
+    {Gs,Tvs,Tus,St2} = guard(Gs0, Vs, St1),
+    {[G|Gs],union(Hvs, Tvs),union(Hus, Tus),St2};
+guard([], _, St) -> {[],[],[],St}.
+
+guard_tests([Gt0|Gts0], Vs, St0) ->
+    {Gt1,Gvs,Gus,St1} = guard_test(Gt0, Vs, St0),
+    {Gts1,Gsvs,Gsus,St2} = guard_tests(Gts0, union(Gvs, Vs), St1),
+    {[Gt1|Gts1],union(Gvs, Gsvs),union(Gus, Gsus),St2};
+guard_tests([], _, St) -> {[],[],[],St}.
+
+guard_test({call,Line,{atom,_,record},[A,{atom,_,Name}]}, Vs, St) ->
+    record_test_in_guard(Line, A, Name, Vs, St);
+guard_test({call,Line,{atom,Lt,Tname},As}, Vs, St) ->
+    %% XXX This is ugly. We can remove this workaround if/when
+    %% we'll allow 'andalso' in guards. For now, we must have
+    %% different code in guards and in bodies.
+    Test = {remote,Lt,
+	    {atom,Lt,erlang},
+	    {atom,Lt,normalise_test(Tname, length(As))}},
+    put(sys_pre_expand_in_guard, yes),
+    R = expr({call,Line,Test,As}, Vs, St),
+    erase(sys_pre_expand_in_guard),
+    R;
+guard_test(Test, Vs, St) ->
+    %% XXX See the previous clause.
+    put(sys_pre_expand_in_guard, yes),
+    R = expr(Test, Vs, St),
+    erase(sys_pre_expand_in_guard),
+    R.
+
+%% record_test(Line, Term, Name, Vs, St) -> TransformedExpr
+%%  Generate code for is_record/1.
+
+record_test(Line, Term, Name, Vs, St) ->
+    case get(sys_pre_expand_in_guard) of
+	undefined ->
+	    record_test_in_body(Line, Term, Name, Vs, St);
+	yes ->
+	    record_test_in_guard(Line, Term, Name, Vs, St)
+    end.
+
+record_test_in_guard(Line, Term, Name, Vs, St) ->
+    %% Notes: (1) To keep is_record/3 properly atomic (e.g. when inverted
+    %%            using 'not'), we cannot convert it to an instruction
+    %%            sequence here. It must remain a single call.
+    %%        (2) Later passes assume that the last argument (the size)
+    %%            is a literal.
+    %%        (3) We don't want calls to erlang:is_record/3 (in the source code)
+    %%            confused we the internal instruction. (Reason: (2) above +
+    %%            code bloat.)
+    %%        (4) Xref may be run on the abstract code, so the name in the
+    %%            abstract code must be erlang:is_record/3.
+    %%        (5) To achive both (3) and (4) at the same time, set the name
+    %%            here to erlang:is_record/3, but mark it as compiler-generated.
+    %%            The v3_core pass will change the name to erlang:internal_is_record/3.
+    Fs = record_fields(Name, St),
+    expr({call,-Line,{remote,-Line,{atom,-Line,erlang},{atom,-Line,is_record}},
+	  [Term,{atom,Line,Name},{integer,Line,length(Fs)+1}]},
+	 Vs, St).
+
+record_test_in_body(Line, Expr, Name, Vs, St0) ->
+    %% As Expr may have side effects, we must evaluate it
+    %% first and bind the value to a new variable.
+    %% We must use also handle the case that Expr does not
+    %% evaluate to a tuple properly.
+    Fs = record_fields(Name, St0),
+    {Var,St} = new_var(Line, St0),
+
+    expr({block,Line,
+	  [{match,Line,Var,Expr},
+	   {op,Line,
+	    'andalso',
+	    {call,Line,{atom,Line,is_tuple},[Var]},
+	    {op,Line,'andalso',
+	     {op,Line,'=:=',
+	      {call,Line,{atom,Line,size},[Var]},
+	      {integer,Line,length(Fs)+1}},
+	     {op,Line,'=:=',
+	      {call,Line,{atom,Line,element},[{integer,Line,1},Var]},
+	      {atom,Line,Name}}}}]}, Vs, St).
+
+normalise_test(atom, 1)      -> is_atom;
+normalise_test(binary, 1)    -> is_binary;
+normalise_test(constant, 1)  -> is_constant;
+normalise_test(float, 1)     -> is_float;
+normalise_test(function, 1)  -> is_function;
+normalise_test(integer, 1)   -> is_integer;
+normalise_test(list, 1)      -> is_list;
+normalise_test(number, 1)    -> is_number;
+normalise_test(pid, 1)       -> is_pid;
+normalise_test(port, 1)      -> is_port;
+normalise_test(reference, 1) -> is_reference;
+normalise_test(tuple, 1)     -> is_tuple;
+normalise_test(Name, _) -> Name.
+
+%% exprs(Expressions, VisibleVariables, State) ->
+%%	{TransformedExprs,NewVariables,UsedVariables,State'}
+
+exprs([E0|Es0], Vs, St0) ->
+    {E,Evs,Eus,St1} = expr(E0, Vs, St0),
+    {Es,Esvs,Esus,St2} = exprs(Es0, union(Evs, Vs), St1),
+    {[E|Es],union(Evs, Esvs),union(Eus, Esus),St2};
+exprs([], _, St) -> {[],[],[],St}.
+
+%% expr(Expression, VisibleVariables, State) ->
+%%	{TransformedExpression,NewVariables,UsedVariables,State'}
+
+expr({var,_,V}=Var, _Vs, St) ->
+    {Var,[],[V],St};
+expr({char,_,_}=Char, _Vs, St) ->
+    {Char,[],[],St};
+expr({integer,_,_}=Int, _Vs, St) ->
+    {Int,[],[],St};
+expr({float,_,_}=Float, _Vs, St) ->
+    {Float,[],[],St};
+expr({atom,_,_}=Atom, _Vs, St) ->
+    {Atom,[],[],St};
+expr({string,_,_}=String, _Vs, St) ->
+    {String,[],[],St};
+expr({nil,_}=Nil, _Vs, St) ->
+    {Nil,[],[],St};
+expr({cons,Line,H0,T0}, Vs, St0) ->
+    {H,Hvs,Hus,St1} = expr(H0, Vs, St0),
+    {T,Tvs,Tus,St2} = expr(T0, Vs, St1),
+    {{cons,Line,H,T},union(Hvs, Tvs),union(Hus, Tus),St2};
+expr({lc,Line,E0,Qs0}, Vs, St0) ->
+    {E1,Qs1,_,Lvs,Lus,St1} = lc_tq(Line, E0, Qs0, {nil,Line}, Vs, St0),
+    {{lc,Line,E1,Qs1},Lvs,Lus,St1};
+expr({tuple,Line,Es0}, Vs, St0) ->
+    {Es1,Esvs,Esus,St1} = expr_list(Es0, Vs, St0),
+    {{tuple,Line,Es1},Esvs,Esus,St1};
+%%expr({struct,Line,Tag,Es0}, Vs, St0) ->
+%%    {Es1,Esvs,Esus,St1} = expr_list(Es0, Vs, St0),
+%%    {{tuple,Line,[{atom,Line,Tag}|Es1]},Esvs,Esus,St1};
+expr({record_field,_,_,_}=M, _Vs, St) ->
+    {expand_package(M, St), [], [], St};  % must be a package name
+expr({record_index,Line,Name,F}, Vs, St) ->
+    I = index_expr(Line, F, Name, record_fields(Name, St)),
+    expr(I, Vs, St);
+expr({record,Line,Name,Is}, Vs, St) ->
+    expr({tuple,Line,[{atom,Line,Name}|
+		      record_inits(record_fields(Name, St), Is)]},
+	 Vs, St);
+expr({record_field,Line,R,Name,F}, Vs, St) ->
+    I = index_expr(Line, F, Name, record_fields(Name, St)),
+    expr({call,Line,{atom,Line,element},[I,R]}, Vs, St);
+expr({record,_,R,Name,Us}, Vs, St0) ->
+    {Ue,St1} = record_update(R, Name, record_fields(Name, St0), Us, St0),
+    expr(Ue, Vs, St1);
+expr({bin,Line,Es0}, Vs, St0) ->
+    {Es1,Esvs,Esus,St1} = expr_bin(Es0, Vs, St0),
+    {{bin,Line,Es1},Esvs,Esus,St1};
+expr({block,Line,Es0}, Vs, St0) ->
+    {Es,Esvs,Esus,St1} = exprs(Es0, Vs, St0),
+    {{block,Line,Es},Esvs,Esus,St1};
+expr({'if',Line,Cs0}, Vs, St0) ->
+    {Cs,Csvss,Csuss,St1} = icr_clauses(Cs0, Vs, St0),
+    All = new_in_all(Vs, Csvss),
+    {{'if',Line,Cs},All,union(Csuss),St1};
+expr({'case',Line,E0,Cs0}, Vs, St0) ->
+    {E,Evs,Eus,St1} = expr(E0, Vs, St0),
+    {Cs,Csvss,Csuss,St2} = icr_clauses(Cs0, union(Evs, Vs), St1),
+    All = new_in_all(Vs, Csvss),
+    {{'case',Line,E,Cs},union(Evs, All),union([Eus|Csuss]),St2};
+expr({'cond',Line,Cs}, Vs, St0) ->
+    {V,St1} = new_var(Line,St0),
+    expr(cond_clauses(Cs,V), Vs, St1);
+expr({'receive',Line,Cs0}, Vs, St0) ->
+    {Cs,Csvss,Csuss,St1} = icr_clauses(Cs0, Vs, St0),
+    All = new_in_all(Vs, Csvss),
+    {{'receive',Line,Cs},All,union(Csuss),St1};
+expr({'receive',Line,Cs0,To0,ToEs0}, Vs, St0) ->
+    {To,Tovs,Tous,St1} = expr(To0, Vs, St0),
+    {ToEs,ToEsvs,_ToEsus,St2} = exprs(ToEs0, Vs, St1),
+    {Cs,Csvss,Csuss,St3} = icr_clauses(Cs0, Vs, St2),
+    All = new_in_all(Vs, [ToEsvs|Csvss]),
+    {{'receive',Line,Cs,To,ToEs},union(Tovs, All),union([Tous|Csuss]),St3};
+expr({'fun',Line,Body}, Vs, St) ->
+    fun_tq(Line, Body, Vs, St);
+%%% expr({call,_,{atom,La,this_module},[]}, _Vs, St) ->
+%%%     {{atom,La,St#expand.module}, [], [], St};
+%%% expr({call,_,{atom,La,this_package},[]}, _Vs, St) ->
+%%%     {{atom,La,list_to_atom(St#expand.package)}, [], [], St};
+%%% expr({call,_,{atom,La,this_package},[{atom,_,Name}]}, _Vs, St) ->
+%%%     M = packages:concat(St#expand.package,Name),
+%%%     {{atom,La,list_to_atom(M)}, [], [], St};
+%%% expr({call,Line,{atom,La,this_package},[A]}, Vs, St) ->
+%%%     M = {call,Line,{remote,La,{atom,La,packages},{atom,La,concat}},
+%%% 	 [{string,La,St#expand.package}, A]},
+%%%     expr({call,Line,{atom,Line,list_to_atom},[M]}, Vs, St);
+expr({call,Line,{atom,_,is_record},[A,{atom,_,Name}]}, Vs, St) ->
+    record_test(Line, A, Name, Vs, St);
+expr({call,Line,{remote,_,{atom,_,erlang},{atom,_,is_record}},
+      [A,{atom,_,Name}]}, Vs, St) ->
+    record_test(Line, A, Name, Vs, St);
+expr({call,Line,{atom,La,N},As0}, Vs, St0) ->
+    {As,Asvs,Asus,St1} = expr_list(As0, Vs, St0),
+    Ar = length(As),
+    case erl_internal:bif(N, Ar) of
+	true ->
+	    {{call,Line,{remote,La,{atom,La,erlang},{atom,La,N}},As},
+	     Asvs,Asus,St1};
+	false ->
+	    case imported(N, Ar, St1) of
+		{yes,Mod} ->
+		    {{call,Line,{remote,La,{atom,La,Mod},{atom,La,N}},As},
+		     Asvs,Asus,St1};
+		no ->
+		    case {N,Ar} of
+			{record_info,2} ->
+			    record_info_call(Line, As, St1);
+			_ ->
+			    {{call,Line,{atom,La,N},As},Asvs,Asus,St1}
+		    end
+	    end
+    end;
+expr({call,Line,{record_field,_,_,_}=M,As0}, Vs, St0) ->
+    expr({call,Line,expand_package(M, St0),As0}, Vs, St0);
+expr({call,Line,{remote,Lr,M,F},As0}, Vs, St0) ->
+    M1 = expand_package(M, St0),
+    {[M2,F1|As1],Asvs,Asus,St1} = expr_list([M1,F|As0], Vs, St0),
+    {{call,Line,{remote,Lr,M2,F1},As1},Asvs,Asus,St1};
+expr({call,Line,{tuple,_,[{atom,_,_}=M,{atom,_,_}=F]},As}, Vs, St) ->
+    %% Rewrite {Mod,Function}(Args...) to Mod:Function(Args...).
+    expr({call,Line,{remote,Line,M,F},As}, Vs, St);
+expr({call,Line,F,As0}, Vs, St0) ->
+    {[Fun1|As1],Asvs,Asus,St1} = expr_list([F|As0], Vs, St0),
+    {{call,Line,Fun1,As1},Asvs,Asus,St1};
+expr({'try',Line,Es0,Scs0,Ccs0,As0}, Vs, St0) ->
+    {Es1,Esvs,Esus,St1} = exprs(Es0, Vs, St0),
+    Cvs = union(Esvs, Vs),
+    {Scs1,Scsvss,Scsuss,St2} = icr_clauses(Scs0, Cvs, St1),
+    {Ccs1,Ccsvss,Ccsuss,St3} = icr_clauses(Ccs0, Cvs, St2),
+    Csvss = Scsvss ++ Ccsvss,
+    Csuss = Scsuss ++ Ccsuss,
+    All = new_in_all(Vs, Csvss),
+    {As1,Asvs,Asus,St4} = exprs(As0, Cvs, St3),
+    {{'try',Line,Es1,Scs1,Ccs1,As1}, union([Asvs,Esvs,All]),
+     union([Esus,Asus|Csuss]), St4};
+expr({'catch',Line,E0}, Vs, St0) ->
+    %% Catch exports no new variables.
+    {E,_Evs,Eus,St1} = expr(E0, Vs, St0),
+    {{'catch',Line,E},[],Eus,St1};
+expr({match,Line,P0,E0}, Vs, St0) ->
+    {E,Evs,Eus,St1} = expr(E0, Vs, St0),
+    {P,Pvs,Pus,St2} = pattern(P0, St1),
+    {{match,Line,P,E},
+     union(subtract(Pvs, Vs), Evs),
+     union(intersection(Pvs, Vs), union(Eus,Pus)),St2};
+expr({op,L,'andalso',E1,E2}, Vs, St0) ->
+    {V,St1} = new_var(L,St0),
+    E = make_bool_switch(L,E1,V,
+			 make_bool_switch(L,E2,V,{atom,L,true},
+					  {atom,L,false}),
+			 {atom,L,false}),
+    expr(E, Vs, St1);
+expr({op,L,'orelse',E1,E2}, Vs, St0) ->
+    {V,St1} = new_var(L,St0),
+    E = make_bool_switch(L,E1,V,{atom,L,true},
+			 make_bool_switch(L,E2,V,{atom,L,true},
+					  {atom,L,false})),
+    expr(E, Vs, St1);
+expr({op,Line,'++',{lc,Ll,E0,Qs0},M0}, Vs, St0) ->
+    {E1,Qs1,M1,Lvs,Lus,St1} = lc_tq(Ll, E0, Qs0, M0, Vs, St0),
+    {{op,Line,'++',{lc,Ll,E1,Qs1},M1},Lvs,Lus,St1};
+expr({op,_,'++',{string,L1,S1},{string,_,S2}}, _Vs, St) ->
+    {{string,L1,S1 ++ S2},[],[],St};
+expr({op,Ll,'++',{string,L1,S1}=Str,R0}, Vs, St0) ->
+    {R1,Rvs,Rus,St1} = expr(R0, Vs, St0),
+    E = case R1 of
+	    {string,_,S2} -> {string,L1,S1 ++ S2};
+	    _Other when length(S1) < 8 -> string_to_conses(L1, S1, R1);
+	    _Other -> {op,Ll,'++',Str,R1}
+	end,
+    {E,Rvs,Rus,St1};
+expr({op,Ll,'++',{cons,Lc,H,T},L2}, Vs, St) ->
+    expr({cons,Ll,H,{op,Lc,'++',T,L2}}, Vs, St);
+expr({op,_,'++',{nil,_},L2}, Vs, St) ->
+    expr(L2, Vs, St);
+expr({op,Line,Op,A0}, Vs, St0) ->
+    {A,Avs,Aus,St1} = expr(A0, Vs, St0),
+    {{op,Line,Op,A},Avs,Aus,St1};
+expr({op,Line,Op,L0,R0}, Vs, St0) ->
+    {L,Lvs,Lus,St1} = expr(L0, Vs, St0),
+    {R,Rvs,Rus,St2} = expr(R0, Vs, St1),
+    {{op,Line,Op,L,R},union(Lvs, Rvs),union(Lus, Rus),St2}.
+
+expr_list([E0|Es0], Vs, St0) ->
+    {E,Evs,Eus,St1} = expr(E0, Vs, St0),
+    {Es,Esvs,Esus,St2} = expr_list(Es0, Vs, St1),
+    {[E|Es],union(Evs, Esvs),union(Eus, Esus),St2};
+expr_list([], _, St) ->
+    {[],[],[],St}.
+
+%% icr_clauses([Clause], [VisibleVariable], State) ->
+%%	{[TransformedClause],[[NewVariable]],[[UsedVariable]],State'}
+%%  Be very careful here to return the variables that are really used
+%%  and really new.
+
+icr_clauses([], _, St) ->
+    {[],[[]],[],St};
+icr_clauses(Clauses, Vs, St) ->
+    icr_clauses2(Clauses, Vs, St).
+
+icr_clauses2([{clause,Line,H0,G0,B0}|Cs0], Vs, St0) ->
+    {H,Hvs,Hus,St1} = head(H0, St0),		%Hvs is really used!
+    {G,Gvs,Gus,St2} = guard(G0, union(Hvs, Vs), St1),
+    {B,Bvs,Bus,St3} = exprs(B0, union([Vs,Hvs,Gvs]), St2),
+    New = subtract(union([Hvs,Gvs,Bvs]), Vs),	%Really new
+    Used = intersection(union([Hvs,Hus,Gus,Bus]), Vs), %Really used
+    {Cs,Csvs,Csus,St4} = icr_clauses2(Cs0, Vs, St3),
+    {[{clause,Line,H,G,B}|Cs],[New|Csvs],[Used|Csus],St4};
+icr_clauses2([], _, St) ->
+    {[],[],[],St}.
+
+%% lc_tq(Line, Expr, Qualifiers, More, [VisibleVar], State) ->
+%%	{TransExpr,[TransQual],TransMore,[NewVar],[UsedVar],State'}
+
+lc_tq(Line, E0, [{generate,Lg,P0,G0}|Qs0], M0, Vs, St0) ->
+    {G1,Gvs,Gus,St1} = expr(G0, Vs, St0),
+    {P1,Pvs,Pus,St2} = pattern(P0, St1),
+    {E1,Qs1,M1,Lvs,Lus,St3} = lc_tq(Line, E0, Qs0, M0, union(Pvs, Vs), St2),
+    {E1,[{generate,Lg,P1,G1}|Qs1],M1,
+     union(Gvs, Lvs),union([Gus,Pus,Lus]),St3};
+lc_tq(Line, E0, [F0|Qs0], M0, Vs, St0) ->
+    %% Allow record/2 and expand out as guard test.
+    case erl_lint:is_guard_test(F0) of
+	true ->
+	    {F1,Fvs,_Fus,St1} = guard_tests([F0], Vs, St0),
+	    {E1,Qs1,M1,Lvs,Lus,St2} = lc_tq(Line, E0, Qs0, M0, union(Fvs, Vs), St1),
+	    {E1,F1++Qs1,M1,Lvs,Lus,St2};
+	false ->
+	    {F1,Fvs,_Fus,St1} = expr(F0, Vs, St0),
+	    {E1,Qs1,M1,Lvs,Lus,St2} = lc_tq(Line, E0, Qs0, M0, union(Fvs, Vs), St1),
+	    {E1,[F1|Qs1],M1,Lvs,Lus,St2}
+    end;
+lc_tq(_Line, E0, [], M0, Vs, St0) ->
+    {E1,Evs,Eus,St1} = expr(E0, Vs, St0),
+    {M1,Mvs,Mus,St2} = expr(M0, Vs, St1),
+    {E1,[],M1,union(Evs, Mvs),union(Eus, Mus),St2}.
+
+%% fun_tq(Line, Body, VisibleVariables, State) ->
+%%	{Fun,NewVariables,UsedVariables,State'}
+%% Transform an "explicit" fun {'fun', Line, {clauses, Cs}} into an
+%% extended form {'fun', Line, {clauses, Cs}, Info}, unless it is the
+%% name of a BIF (erl_lint has checked that it is not an import).
+%% Process the body sequence directly to get the new and used variables.
+%% "Implicit" funs {'fun', Line, {function, F, A}} are not changed.
+
+fun_tq(Lf, {function,F,A}, Vs, St0) ->
+    {As,St1} = new_vars(A, Lf, St0),
+    Cs = [{clause,Lf,As,[],[{call,Lf,{atom,Lf,F},As}]}],
+    case erl_internal:bif(F, A) of
+	true ->
+	    fun_tq(Lf, {clauses,Cs}, Vs, St1);
+	false ->
+	    Index = St0#expand.fun_index,
+	    Uniq = erlang:hash(Cs, (1 bsl 27)-1),
+	    {Fname,St2} = new_fun_name(St1),
+	    {{'fun',Lf,{function,F,A},{Index,Uniq,Fname}},[],[],
+	     St2#expand{fun_index=Index+1}}
+    end;
+fun_tq(Lf, {clauses,Cs0}, Vs, St0) ->
+    Uniq = erlang:hash(Cs0, (1 bsl 27)-1),
+    {Cs1,_Hvss,Frees,St1} = fun_clauses(Cs0, Vs, St0),
+    Ufrees = union(Frees),
+    Index = St1#expand.fun_index,
+    {Fname,St2} = new_fun_name(St1),
+    {{'fun',Lf,{clauses,Cs1},{Index,Uniq,Fname}},[],Ufrees,
+     St2#expand{fun_index=Index+1}}.
+
+fun_clauses([{clause,L,H0,G0,B0}|Cs0], Vs, St0) ->
+    {H,Hvs,Hus,St1} = head(H0, St0),
+    {G,Gvs,Gus,St2} = guard(G0, union(Hvs, Vs), St1),
+    {B,Bvs,Bus,St3} = exprs(B0, union([Vs,Hvs,Gvs]), St2),
+    %% Free variables cannot be new anywhere in the clause.
+    Free = subtract(union([Gus,Hus,Bus]), union([Hvs,Gvs,Bvs])),
+    %%io:format(" Gus :~p~n Bvs :~p~n Bus :~p~n Free:~p~n" ,[Gus,Bvs,Bus,Free]),
+    {Cs,Hvss,Frees,St4} = fun_clauses(Cs0, Vs, St3),
+    {[{clause,L,H,G,B}|Cs],[Hvs|Hvss],[Free|Frees],St4};
+fun_clauses([], _, St) -> {[],[],[],St}.
+
+%% new_fun_name(State) -> {FunName,State}.
+
+new_fun_name(#expand{func=F,arity=A,fcount=I}=St) ->
+    Name = "-" ++ atom_to_list(F) ++ "/" ++ integer_to_list(A)
+	++ "-fun-" ++ integer_to_list(I) ++ "-",
+    {list_to_atom(Name),St#expand{fcount=I+1}}.
+
+
+%% normalise_fields([RecDef]) -> [Field].
+%%  Normalise the field definitions to always have a default value. If
+%%  none has been given then use 'undefined'.
+
+normalise_fields(Fs) ->
+    map(fun ({record_field,Lf,Field}) ->
+		{record_field,Lf,Field,{atom,Lf,undefined}};
+	    (F) -> F end, Fs).
+
+%% record_fields(RecordName, State)
+%% find_field(FieldName, Fields)
+
+record_fields(R, St) -> dict:fetch(R, St#expand.records).
+
+find_field(F, [{record_field,_,{atom,_,F},Val}|_]) -> {ok,Val};
+find_field(F, [_|Fs]) -> find_field(F, Fs);
+find_field(_, []) -> error.
+
+%% field_names(RecFields) -> [Name].
+%%  Return a list of the field names structures.
+
+field_names(Fs) ->
+    map(fun ({record_field,_,Field,_Val}) -> Field end, Fs).
+
+%% index_expr(Line, FieldExpr, Name, Fields) -> IndexExpr.
+%%  Return an expression which evaluates to the index of a
+%%  field. Currently only handle the case where the field is an
+%%  atom. This expansion must be passed through expr again.
+
+index_expr(Line, {atom,_,F}, _Name, Fs) ->
+    {integer,Line,index_expr(F, Fs, 2)}.
+
+index_expr(F, [{record_field,_,{atom,_,F},_}|_], I) -> I;
+index_expr(F, [_|Fs], I) ->
+    index_expr(F, Fs, I+1).
+
+%% pattern_fields([RecDefField], [Match]) -> [Pattern].
+%%  Build a list of match patterns for the record tuple elements.
+%%  This expansion must be passed through pattern again. N.B. We are
+%%  scanning the record definition field list!
+
+pattern_fields(Fs, Ms) ->
+    Wildcard = record_wildcard_init(Ms),
+    map(fun ({record_field,L,{atom,_,F},_}) ->
+		case find_field(F, Ms) of
+		    {ok,Match} -> Match;
+		    error when Wildcard =:= none -> {var,L,'_'};
+		    error -> Wildcard
+		end end,
+	Fs).
+
+%% record_inits([RecDefField], [Init]) -> [InitExpr].
+%%  Build a list of initialisation expressions for the record tuple
+%%  elements. This expansion must be passed through expr
+%%  again. N.B. We are scanning the record definition field list!
+
+record_inits(Fs, Is) ->
+    WildcardInit = record_wildcard_init(Is),
+    map(fun ({record_field,_,{atom,_,F},D}) ->
+		case find_field(F, Is) of
+		    {ok,Init} -> Init;
+		    error when WildcardInit =:= none -> D;
+		    error -> WildcardInit
+		end end,
+	Fs).
+
+record_wildcard_init([{record_field,_,{var,_,'_'},D}|_]) -> D;
+record_wildcard_init([_|Is]) -> record_wildcard_init(Is);
+record_wildcard_init([]) -> none.
+
+%% record_update(Record, RecordName, [RecDefField], [Update], State) ->
+%%	{Expr,State'}
+%%  Build an expression to update fields in a record returning a new
+%%  record.  Try to be smart and optimise this. This expansion must be
+%%  passed through expr again.
+
+record_update(R, Name, Fs, Us0, St0) ->
+    Line = element(2, R),
+    {Pre,Us,St1} = record_exprs(Us0, St0),
+    Nf = length(Fs),				%# of record fields
+    Nu = length(Us),				%# of update fields
+    Nc = Nf - Nu,				%# of copy fields
+
+    %% We need a new variable for the record expression
+    %% to guarantee that it is only evaluated once.
+    {Var,St2} = new_var(Line, St1),
+
+    %% Try to be intelligent about which method of updating record to use.
+    {Update,St} =
+	if
+	    Nu == 0 -> {R,St2};			%No fields updated
+	    Nu =< Nc ->				%Few fields updated
+		{record_setel(Var, Name, Fs, Us), St2};
+	    true ->			      %The wide area inbetween
+		record_match(Var, Name, Fs, Us, St2)
+	end,
+    {{block,element(2, R),Pre ++ [{match,Line,Var,R},Update]},St}.
+
+%% record_match(Record, RecordName, [RecDefField], [Update], State)
+%%  Build a 'case' expression to modify record fields.
+
+record_match(R, Name, Fs, Us, St0) ->
+    {Ps,News,St1} = record_upd_fs(Fs, Us, St0),
+    Lr = element(2, hd(Us)),
+    {{'case',Lr,R,
+      [{clause,Lr,[{tuple,Lr,[{atom,Lr,Name}|Ps]}],[],
+	[{tuple,Lr,[{atom,Lr,Name}|News]}]},
+       {clause,Lr,[{var,Lr,'_'}],[],
+	[call_error(Lr, {tuple,Lr,[{atom,Lr,badrecord},{atom,Lr,Name}]})]}
+      ]},
+     St1}.
+
+record_upd_fs([{record_field,Lf,{atom,_La,F},_Val}|Fs], Us, St0) ->
+    {P,St1} = new_var(Lf, St0),
+    {Ps,News,St2} = record_upd_fs(Fs, Us, St1),
+    case find_field(F, Us) of
+	{ok,New} -> {[P|Ps],[New|News],St2};
+	error -> {[P|Ps],[P|News],St2}
+    end;
+record_upd_fs([], _, St) -> {[],[],St}.
+
+%% record_setel(Record, RecordName, [RecDefField], [Update])
+%%  Build a nested chain of setelement calls to build the
+%%  updated record tuple.
+
+record_setel(R, Name, Fs, Us0) ->
+    Us1 = foldl(fun ({record_field,Lf,Field,Val}, Acc) ->
+			I = index_expr(Lf, Field, Name, Fs),
+			[{I,Lf,Val}|Acc]
+		end, [], Us0),
+    Us = sort(Us1),
+    Lr = element(2, hd(Us)),
+    Wildcards = duplicate(length(Fs), {var,Lr,'_'}),
+    {'case',Lr,R,
+     [{clause,Lr,[{tuple,Lr,[{atom,Lr,Name}|Wildcards]}],[],
+       [foldr(fun ({I,Lf,Val}, Acc) ->
+		      {call,Lf,{atom,Lf,setelement},[I,Acc,Val]} end,
+	      R, Us)]},
+      {clause,Lr,[{var,Lr,'_'}],[],
+       [call_error(Lr, {tuple,Lr,[{atom,Lr,badrecord},{atom,Lr,Name}]})]}]}.
+
+%% Expand a call to record_info/2. We have checked that it is not
+%% shadowed by an import.
+
+record_info_call(Line, [{atom,_Li,Info},{atom,_Ln,Name}], St) ->
+    case Info of
+	size ->
+	    {{integer,Line,1+length(record_fields(Name, St))},[],[],St};
+	fields ->
+	    {make_list(field_names(record_fields(Name, St)), Line),
+	     [],[],St}
+    end.
+
+%% Break out expressions from an record update list and bind to new
+%% variables. The idea is that we will evaluate all update expressions
+%% before starting to update the record.
+
+record_exprs(Us, St) ->
+    record_exprs(Us, St, [], []).
+
+record_exprs([{record_field,Lf,{atom,_La,_F}=Name,Val}=Field0|Us], St0, Pre, Fs) ->
+    case is_simple_val(Val) of
+	true ->
+	    record_exprs(Us, St0, Pre, [Field0|Fs]);
+	false ->
+	    {Var,St} = new_var(Lf, St0),
+	    Bind = {match,Lf,Var,Val},
+	    Field = {record_field,Lf,Name,Var},
+	    record_exprs(Us, St, [Bind|Pre], [Field|Fs])
+    end;
+record_exprs([], St, Pre, Fs) ->
+    {reverse(Pre),Fs,St}.
+
+is_simple_val({var,_,_}) -> true;
+is_simple_val({atom,_,_}) -> true;
+is_simple_val({integer,_,_}) -> true;
+is_simple_val({float,_,_}) -> true;
+is_simple_val({nil,_}) -> true;
+is_simple_val(_) -> false.
+
+%% pattern_bin([Element], State) -> {[Element],[Variable],[UsedVar],State}.
+
+pattern_bin(Es0, St) ->
+    Es1 = bin_expand_strings(Es0),
+    foldr(fun (E, Acc) -> pattern_element(E, Acc) end, {[],[],[],St}, Es1).
+
+pattern_element({bin_element,Line,Expr,Size,Type}, {Es,Esvs,Esus,St0}) ->
+    {Expr1,Vs1,Us1,St1} = pattern(Expr, St0),
+    {Size1,Vs2,Us2,St2} = pat_bit_size(Size, St1),
+    {Size2,Type1} = make_bit_type(Line, Size1,Type),
+    {[{bin_element,Line,Expr1,Size2,Type1}|Es],
+      union([Vs1,Vs2,Esvs]),union([Us1,Us2,Esus]),St2}.
+
+pat_bit_size(default, St) -> {default,[],[],St};
+pat_bit_size({atom,_La,all}=All, St) -> {All,[],[],St};
+pat_bit_size({var,_Lv,V}=Var, St) -> {Var,[],[V],St};
+pat_bit_size(Size, St) ->
+    Line = element(2, Size),
+    {value,Sz,_} = erl_eval:expr(Size, erl_eval:new_bindings()),
+    {{integer,Line,Sz},[],[],St}.
+
+make_bit_type(Line, default, Type0) ->
+    case erl_bits:set_bit_type(default, Type0) of
+	{ok,all,Bt} -> {{atom,Line,all},erl_bits:as_list(Bt)};
+	{ok,Size,Bt} -> {{integer,Line,Size},erl_bits:as_list(Bt)}
+    end;
+make_bit_type(_Line, Size, Type0) ->		%Integer or 'all'
+    {ok,Size,Bt} = erl_bits:set_bit_type(Size, Type0),
+    {Size,erl_bits:as_list(Bt)}.
+
+%% expr_bin([Element], [VisibleVar], State) ->
+%%              {[Element],[NewVar],[UsedVar],State}.
+
+expr_bin(Es0, Vs, St) ->
+    Es1 = bin_expand_strings(Es0),
+    foldr(fun (E, Acc) -> bin_element(E, Vs, Acc) end, {[],[],[],St}, Es1).
+
+bin_element({bin_element,Line,Expr,Size,Type}, Vs, {Es,Esvs,Esus,St0}) ->
+    {Expr1,Vs1,Us1,St1} = expr(Expr, Vs, St0),
+    {Size1,Vs2,Us2,St2} = if Size == default -> {default,[],[],St1};
+			     true -> expr(Size, Vs, St1)
+			  end,
+    {Size2,Type1} = make_bit_type(Line, Size1, Type),
+    {[{bin_element,Line,Expr1,Size2,Type1}|Es],
+     union([Vs1,Vs2,Esvs]),union([Us1,Us2,Esus]),St2}.
+
+bin_expand_strings(Es) ->
+    foldr(fun ({bin_element,Line,{string,_,S},default,default}, Es1) ->
+		  foldr(fun (C, Es2) ->
+				[{bin_element,Line,{char,Line,C},default,default}|Es2]
+			end, Es1, S);
+	      (E, Es1) -> [E|Es1]
+	  end, [], Es).
+
+%% new_var_name(State) -> {VarName,State}.
+
+new_var_name(St) ->
+    C = St#expand.vcount,
+    {list_to_atom("pre" ++ integer_to_list(C)),St#expand{vcount=C+1}}.
+
+%% new_var(Line, State) -> {Var,State}.
+
+new_var(L, St0) ->
+    {New,St1} = new_var_name(St0),
+    {{var,L,New},St1}.
+
+%% new_vars(Count, Line, State) -> {[Var],State}.
+%%  Make Count new variables.
+
+new_vars(N, L, St) -> new_vars(N, L, St, []).
+
+new_vars(N, L, St0, Vs) when N > 0 ->
+    {V,St1} = new_var(L, St0),
+    new_vars(N-1, L, St1, [V|Vs]);
+new_vars(0, _L, St, Vs) -> {Vs,St}.
+
+%% make_list(TermList, Line) ->	ConsTerm.
+
+make_list(Ts, Line) ->
+    foldr(fun (H, T) -> {cons,Line,H,T} end, {nil,Line}, Ts).
+
+string_to_conses(Line, Cs, Tail) ->
+    foldr(fun (C, T) -> {cons,Line,{char,Line,C},T} end, Tail, Cs).
+
+
+%% In syntax trees, module/package names are atoms or lists of atoms.
+
+package_to_string(A) when atom(A) -> atom_to_list(A);
+package_to_string(L) when list(L) -> packages:concat(L).
+
+expand_package({atom,L,A} = M, St) ->
+    case dict:find(A, St#expand.mod_imports) of
+	{ok, A1} ->
+	    {atom,L,A1};
+	error ->
+	    case packages:is_segmented(A) of
+		true ->
+		    M;
+		false ->
+		    M1 = packages:concat(St#expand.package, A),
+		    {atom,L,list_to_atom(M1)}
+	    end
+    end;
+expand_package(M, _St) ->
+    case erl_parse:package_segments(M) of
+	error ->
+	    M;
+	M1 ->
+	    {atom,element(2,M),list_to_atom(package_to_string(M1))}
+    end.
+
+%% Create a case-switch on true/false, generating badarg for all other
+%% values.
+
+make_bool_switch(L, E, V, T, F) ->
+    make_bool_switch_1(L, E, V, [T], [F]).
+
+make_bool_switch_1(L, E, V, T, F) ->
+    case get(sys_pre_expand_in_guard) of
+	undefined -> make_bool_switch_body(L, E, V, T, F);
+	yes -> make_bool_switch_guard(L, E, V, T, F)
+    end.
+
+make_bool_switch_guard(_, E, _, [{atom,_,true}], [{atom,_,false}]) -> E;
+make_bool_switch_guard(L, E, V, T, F) ->
+    NegL = -abs(L),
+    {'case',NegL,E,
+     [{clause,NegL,[{atom,NegL,true}],[],T},
+      {clause,NegL,[{atom,NegL,false}],[],F},
+      {clause,NegL,[V],[],[V]}
+     ]}.
+
+make_bool_switch_body(L, E, V, T, F) ->
+    NegL = -abs(L),
+    {'case',NegL,E,
+     [{clause,NegL,[{atom,NegL,true}],[],T},
+      {clause,NegL,[{atom,NegL,false}],[],F},
+      {clause,NegL,[V],[],
+       [call_error(NegL,{tuple,NegL,[{atom,NegL,badarg},V]})]}
+     ]}.
+
+%% Expand a list of cond-clauses to a sequence of case-switches.
+
+cond_clauses([{clause,L,[],[[E]],B}],V) ->
+    make_bool_switch_1(L,E,V,B,[call_error(L,{atom,L,cond_clause})]);
+cond_clauses([{clause,L,[],[[E]],B} | Cs],V) ->
+    make_bool_switch_1(L,E,V,B,[cond_clauses(Cs,V)]).
+
+%% call_error(Line, Reason) -> Expr.
+%%  Build a call to erlang:error/1 with reason Reason.
+
+call_error(L, R) ->
+    {call,L,{remote,L,{atom,L,erlang},{atom,L,error}},[R]}.
+
+%% new_in_all(Before, RegionList) -> NewInAll
+%%  Return the variables new in all clauses.
+
+new_in_all(Before, Region) ->
+    InAll = intersection(Region),
+    subtract(InAll, Before).
+
+%% import(Line, Imports, State) ->
+%%	State'
+%% imported(Name, Arity, State) ->
+%%	{yes,Module} | no
+%%  Handle import declarations and est for imported functions. No need to
+%%  check when building imports as code is correct.
+
+import({Mod0,Fs}, St) ->
+    Mod = list_to_atom(package_to_string(Mod0)),
+    Mfs = from_list(Fs),
+    St#expand{imports=add_imports(Mod, Mfs, St#expand.imports)};
+import(Mod0, St) ->
+    Mod = package_to_string(Mod0),
+    Key = list_to_atom(packages:last(Mod)),
+    St#expand{mod_imports=dict:store(Key, list_to_atom(Mod),
+				     St#expand.mod_imports)}.
+
+add_imports(Mod, [F|Fs], Is) ->
+    add_imports(Mod, Fs, orddict:store(F, Mod, Is));
+add_imports(_, [], Is) -> Is.
+
+imported(F, A, St) ->
+    case orddict:find({F,A}, St#expand.imports) of
+	{ok,Mod} -> {yes,Mod};
+	error -> no
+    end.