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-rw-r--r--lib/stdlib/test/io_SUITE.erl15
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/stdlib/test/io_SUITE.erl b/lib/stdlib/test/io_SUITE.erl
index b2754e47ba..fb62e3aa3c 100644
--- a/lib/stdlib/test/io_SUITE.erl
+++ b/lib/stdlib/test/io_SUITE.erl
@@ -2348,4 +2348,19 @@ otp_14285(_Config) ->
L1 = [S || C <- Chars, S <- io_lib:write_atom(list_to_atom([C])),
not is_latin1(S)],
L1 = lists:seq(256, 512),
+
+ latin1_fmt("~w", ['кирилли́ческий атом']),
+ latin1_fmt("~w", ['\x{10FFFF}']),
+ "'кирилли́ческий атом'" = fmt("~tw", ['кирилли́ческий атом']),
+ [$',16#10FFFF,$'] = fmt("~tw", ['\x{10FFFF}']),
+
+ latin1_fmt("~W", ['кирилли́ческий атом', 13]),
+ latin1_fmt("~W", ['\x{10FFFF}', 13]),
+ "'кирилли́ческий атом'" = fmt("~tW", ['кирилли́ческий атом', 13]),
+ [$',16#10FFFF,$'] = fmt("~tW", ['\x{10FFFF}', 13]),
+
ok.
+
+latin1_fmt(Fmt, Args) ->
+ L = fmt(Fmt, Args),
+ true = lists:all(fun is_latin1/1, L).