diff options
Diffstat (limited to 'lib/stdlib/test')
| -rw-r--r-- | lib/stdlib/test/ms_transform_SUITE.erl | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/lib/stdlib/test/ms_transform_SUITE.erl b/lib/stdlib/test/ms_transform_SUITE.erl index 79a0a9af89..2d90d5b823 100644 --- a/lib/stdlib/test/ms_transform_SUITE.erl +++ b/lib/stdlib/test/ms_transform_SUITE.erl @@ -37,6 +37,7 @@ -export([andalso_orelse/1]). -export([float_1_function/1]). -export([action_function/1]). +-export([warnings/1]). -export([init_per_testcase/2, fin_per_testcase/2]). init_per_testcase(_Func, Config) -> @@ -50,8 +51,90 @@ fin_per_testcase(_Func, Config) -> all(suite) -> [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, semicolon]. +%% This may be subject to change +-define(WARN_NUMBER_SHADOW,50). +warnings(suite) -> + []; +warnings(doc) -> + ["Check that shadowed variables in fun head generate warning"]; +warnings(Config) when is_list(Config) -> + ?line setup(Config), + Prog = <<"A=5, " + "ets:fun2ms(fun({A,B}) " + " when is_integer(A) and (A+5 > B) -> " + " A andalso B " + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'A'}}]}] = + compile_ww(Prog), + Prog2 = <<"C=5, " + "ets:fun2ms(fun({A,B} = C) " + " when is_integer(A) and (A+5 > B) -> " + " {A andalso B,C} " + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'C'}}]}] = + compile_ww(Prog2), + Rec3 = <<"-record(a,{a,b,c,d=foppa}).">>, + Prog3 = <<"A=3,C=5, " + "ets:fun2ms(fun(#a{a = A, b = B} = C) " + " when is_integer(A) and (A+5 > B) -> " + " {A andalso B,C} " + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'A'}}, + {_,ms_transform,{?WARN_NUMBER_SHADOW,'C'}}]}] = + compile_ww(Rec3,Prog3), + Rec4 = <<"-record(a,{a,b,c,d=foppa}).">>, + Prog4 = <<"A=3,C=5, " + "F = fun(B) -> B*3 end," + "erlang:display(F(A))," + "ets:fun2ms(fun(#a{a = A, b = B} = C) " + " when is_integer(A) and (A+5 > B) -> " + " {A andalso B,C} " + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'A'}}, + {_,ms_transform,{?WARN_NUMBER_SHADOW,'C'}}]}] = + compile_ww(Rec4,Prog4), + Rec5 = <<"-record(a,{a,b,c,d=foppa}).">>, + Prog5 = <<"A=3,C=5, " + "F = fun(B) -> B*3 end," + "erlang:display(F(A))," + "B = ets:fun2ms(fun(#a{a = A, b = B} = C) " + " when is_integer(A) and (A+5 > B) -> " + " {A andalso B,C} " + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'A'}}, + {_,ms_transform,{?WARN_NUMBER_SHADOW,'C'}}]}] = + compile_ww(Rec5,Prog5), + Prog6 = <<" X=bar, " + " A = case X of" + " foo ->" + " foo;" + " Y ->" + " ets:fun2ms(fun(Y) ->" % This is a warning + " 3*Y" + " end)" + " end," + " ets:fun2ms(fun(Y) ->" % Y out of "scope" here, so no warning + " {3*Y,A}" + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'Y'}}]}] = + compile_ww(Prog6), + Prog7 = <<" X=bar, " + " A = case X of" + " foo ->" + " Y = foo;" + " Y ->" + " bar" + " end," + " ets:fun2ms(fun(Y) ->" % Y exported from case and safe, so warn + " {3*Y,A}" + " end)">>, + ?line [{_,[{_,ms_transform,{?WARN_NUMBER_SHADOW,'Y'}}]}] = + compile_ww(Prog7), + ok. + andalso_orelse(suite) -> []; andalso_orelse(doc) -> @@ -721,6 +804,24 @@ compile_and_run(Records,Expr) -> code:load_binary(tmp,FN,Bin), tmp:tmp(). +compile_ww(Expr) -> + compile_ww(<<>>,Expr). +compile_ww(Records,Expr) -> + Prog = << + "-module(tmp).\n", + "-include_lib(\"stdlib/include/ms_transform.hrl\").\n", + "-export([tmp/0]).\n", + Records/binary,"\n", + "tmp() ->\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( [], |