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Improve send return types #15644

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Merged
josevalim merged 1 commit into from
Jul 21, 2026
Merged

Improve send return types #15644

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7 changes: 7 additions & 0 deletions lib/elixir/lib/module/types/apply.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -1099,6 +1099,13 @@ defmodule Module.Types.Apply do
end
end

defp remote_apply(:erlang, :send, info, [_dest, message] = args_types, stack) do
case remote_apply(info, args_types, stack) do
{:ok, _type} -> {:ok, return(message, args_types, stack)}
other -> other
end
end

defp remote_apply(:erlang, :tl, _info, [list], stack) do
case list_tl(list) do
{:ok, value_type} -> {:ok, return(value_type, [list], stack)}
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7 changes: 7 additions & 0 deletions lib/elixir/test/elixir/module/types/expr_test.exs
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Expand Up @@ -444,6 +444,13 @@ defmodule Module.Types.ExprTest do
) == dynamic(tuple([integer(), integer(), binary()]))
end

test "send returns the message" do
assert typecheck!(send(self(), {:msg, 1})) == tuple([atom([:msg]), integer()])

assert typeerror!(send(123, {:msg, 1})) =~
"incompatible types given to Kernel.send/2"
end

test "undefined function warnings" do
assert typewarn!(URI.unknown("foo")) ==
{dynamic(), "URI.unknown/1 is undefined or private"}
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