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-rw-r--r--lib/stdlib/src/io_lib_format.erl5
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/stdlib/src/io_lib_format.erl b/lib/stdlib/src/io_lib_format.erl
index c7b75961cb..3113767614 100644
--- a/lib/stdlib/src/io_lib_format.erl
+++ b/lib/stdlib/src/io_lib_format.erl
@@ -265,7 +265,10 @@ control($W, [A,Depth], F, Adj, P, Pad, _Enc, _Str, _I) when is_integer(Depth) ->
term(io_lib:write(A, Depth), F, Adj, P, Pad);
control($P, [A,Depth], F, Adj, P, Pad, Enc, Str, I) when is_integer(Depth) ->
print(A, Depth, F, Adj, P, Pad, Enc, Str, I);
-control($s, [A], F, Adj, P, Pad, _Enc, _Str, _I) when is_atom(A) ->
+control($s, [A], F, Adj, P, Pad, latin1, _Str, _I) when is_atom(A) ->
+ L = iolist_to_chars(atom_to_list(A)),
+ string(L, F, Adj, P, Pad);
+control($s, [A], F, Adj, P, Pad, unicode, _Str, _I) when is_atom(A) ->
string(atom_to_list(A), F, Adj, P, Pad);
control($s, [L0], F, Adj, P, Pad, latin1, _Str, _I) ->
L = iolist_to_chars(L0),