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-rw-r--r--lib/stdlib/src/string.erl8
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index e01bb7d85e..4e89819e41 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -420,10 +420,12 @@ to_number(_, Number, Rest, _, Tail) ->
%% Return the remaining string with prefix removed or else nomatch
-spec prefix(String::unicode:chardata(), Prefix::unicode:chardata()) ->
'nomatch' | unicode:chardata().
-prefix(Str, []) -> Str;
prefix(Str, Prefix0) ->
- Prefix = unicode:characters_to_list(Prefix0),
- case prefix_1(Str, Prefix) of
+ Result = case unicode:characters_to_list(Prefix0) of
+ [] -> Str;
+ Prefix -> prefix_1(Str, Prefix)
+ end,
+ case Result of
[] when is_binary(Str) -> <<>>;
Res -> Res
end.