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-rw-r--r--lib/stdlib/src/ms_transform.erl17
-rw-r--r--lib/stdlib/test/ms_transform_SUITE.erl45
2 files changed, 53 insertions, 9 deletions
diff --git a/lib/stdlib/src/ms_transform.erl b/lib/stdlib/src/ms_transform.erl
index 48e22e53fa..63b397f3a5 100644
--- a/lib/stdlib/src/ms_transform.erl
+++ b/lib/stdlib/src/ms_transform.erl
@@ -333,17 +333,18 @@ form({function,Line,Name0,Arity0,Clauses0}) ->
form(AnyOther) ->
AnyOther.
function(Name, Arity, Clauses0) ->
- {Clauses1,_} = clauses(Clauses0,gb_sets:new()),
+ Clauses1 = clauses(Clauses0),
{Name,Arity,Clauses1}.
-clauses([C0|Cs],Bound) ->
- {C1,Bound1} = clause(C0,Bound),
- {C2,Bound2} = clauses(Cs,Bound1),
- {[C1|C2],Bound2};
-clauses([],Bound) -> {[],Bound}.
+clauses([C0|Cs]) ->
+ C1 = clause(C0,gb_sets:new()),
+ C2 = clauses(Cs),
+ [C1|C2];
+clauses([]) -> [].
+
clause({clause,Line,H0,G0,B0},Bound) ->
{H1,Bound1} = copy(H0,Bound),
- {B1,Bound2} = copy(B0,Bound1),
- {{clause,Line,H1,G0,B1},Bound2}.
+ {B1,_Bound2} = copy(B0,Bound1),
+ {clause,Line,H1,G0,B1}.
copy({call,Line,{remote,_Line2,{atom,_Line3,ets},{atom,_Line4,fun2ms}},
As0},Bound) ->
diff --git a/lib/stdlib/test/ms_transform_SUITE.erl b/lib/stdlib/test/ms_transform_SUITE.erl
index 4e5df12798..c9688354b1 100644
--- a/lib/stdlib/test/ms_transform_SUITE.erl
+++ b/lib/stdlib/test/ms_transform_SUITE.erl
@@ -39,6 +39,7 @@
-export([float_1_function/1]).
-export([action_function/1]).
-export([warnings/1]).
+-export([no_warnings/1]).
-export([init_per_testcase/2, end_per_testcase/2]).
init_per_testcase(_Func, Config) ->
@@ -55,7 +56,7 @@ all() ->
[from_shell, basic_ets, basic_dbg, records,
record_index, multipass, bitsyntax, record_defaults,
andalso_orelse, float_1_function, action_function,
- warnings, top_match, old_guards, autoimported,
+ warnings, no_warnings, top_match, old_guards, autoimported,
semicolon].
groups() ->
@@ -155,6 +156,34 @@ warnings(Config) when is_list(Config) ->
compile_ww(Prog7),
ok.
+no_warnings(suite) ->
+ [];
+no_warnings(doc) ->
+ ["Check that variables bound in other function clauses don't generate "
+ "warning"];
+no_warnings(Config) when is_list(Config) ->
+ ?line setup(Config),
+ Prog = <<"tmp(X) when X > 100 ->\n",
+ " Y=X,\n"
+ " Y;\n"
+ "tmp(X) ->\n"
+ " ets:fun2ms(fun(Y) ->\n"
+ " {X, 3*Y}\n"
+ " end)">>,
+ ?line [] = compile_no_ww(Prog),
+
+ Prog2 = <<"tmp(X) when X > 100 ->\n",
+ " Y=X,\n"
+ " Y;\n"
+ "tmp(X) when X < 200 ->\n"
+ " ok;\n"
+ "tmp(X) ->\n"
+ " ets:fun2ms(fun(Y) ->\n"
+ " {X, 3*Y}\n"
+ " end)">>,
+ ?line [] = compile_no_ww(Prog2),
+ ok.
+
andalso_orelse(suite) ->
[];
andalso_orelse(doc) ->
@@ -842,6 +871,20 @@ compile_ww(Records,Expr) ->
nowarn_unused_record]),
Wlist.
+compile_no_ww(Expr) ->
+ Prog = <<
+ "-module(tmp).\n",
+ "-include_lib(\"stdlib/include/ms_transform.hrl\").\n",
+ "-export([tmp/1]).\n\n",
+ Expr/binary,".\n">>,
+ FN=temp_name(),
+ file:write_file(FN,Prog),
+ {ok,Forms} = epp:parse_file(FN,"",""),
+ {ok,tmp,_Bin,Wlist} = compile:forms(Forms,[return_warnings,
+ nowarn_unused_vars,
+ nowarn_unused_record]),
+ Wlist.
+
do_eval(String) ->
{done,{ok,T,_},[]} = erl_scan:tokens(
[],