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-rw-r--r--erts/preloaded/src/erts_internal.erl3
1 files changed, 2 insertions, 1 deletions
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 6aae5ba38c..f4518c4008 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -438,10 +438,11 @@ microstate_accounting(Ref, Threads) ->
trace(_PidSpec, _How, _FlagList) ->
erlang:nif_error(undefined).
+-type match_variable() :: atom(). % Approximation of '$1' | '$2' | ...
-type trace_pattern_mfa() ::
{atom(),atom(),arity() | '_'} | on_load.
-type trace_match_spec() ::
- [{[term()] | '_' ,[term()],[term()]}].
+ [{[term()] | '_' | match_variable() ,[term()],[term()]}].
-spec trace_pattern(MFA, MatchSpec, FlagList) -> non_neg_integer() when
MFA :: trace_pattern_mfa(),