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authorHans Bolinder <[email protected]>2018-02-15 16:30:12 +0100
committerHans Bolinder <[email protected]>2018-02-21 10:10:24 +0100
commit40a3cb7a4657175e5f385d326a63ef012f51585d (patch)
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dialyzer: Correct a parameterized opaque types bug
See also https://bugs.erlang.org/browse/ERL-565. To avoid loops, erl_types:t_is_subtype checks for equality using unopaqued types, but in (at least) one case something is lost: This fix makes sure that when forwarding arguments in dataflow, types with different parameters but equal when unopaqued are considered different. For example, dict:dict(0, {}) and dict:dict(0, []) are equal when unopaqued (due to how dict(_, _) is declared in module dict), but should be considered different when forwarding args.
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