[erlang-questions] peculiar type spec

Raghav Karol <>
Tue Jan 24 23:02:12 CET 2017


I recently came across this type specification

-type index_spec() :: {add, Index, SecondaryKey} | {remove, Index,
SecondaryKey}.

* Is this a `type variable', see [1] and how does one interpret it?

Best,
Raghav

[1] http://erlang.org/doc/reference_manual/typespec.html
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