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-rw-r--r--lib/compiler/src/erl_bifs.erl1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/compiler/src/erl_bifs.erl b/lib/compiler/src/erl_bifs.erl
index 70b36f029e..a7452aebc8 100644
--- a/lib/compiler/src/erl_bifs.erl
+++ b/lib/compiler/src/erl_bifs.erl
@@ -94,6 +94,7 @@ is_pure(erlang, is_function, 1) -> true;
is_pure(erlang, is_integer, 1) -> true;
is_pure(erlang, is_list, 1) -> true;
is_pure(erlang, is_map, 1) -> true;
+is_pure(erlang, is_map_key, 2) -> true;
is_pure(erlang, is_number, 1) -> true;
is_pure(erlang, is_pid, 1) -> true;
is_pure(erlang, is_port, 1) -> true;