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Defer function application computations until needed #15676

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Merged
josevalim merged 3 commits into from
Jul 25, 2026
Merged

Defer function application computations until needed #15676

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36c49eb
Defer function application computations until needed
preciz Jul 25, 2026
d7f399d
Defer function application setup until normalization
preciz Jul 25, 2026
1683c25
Refactor normalization logic in descr.ex
josevalim Jul 25, 2026
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9 changes: 5 additions & 4 deletions lib/elixir/lib/module/types/descr.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -1434,15 +1434,16 @@ defmodule Module.Types.Descr do
# applying dynamic arrows to upper-bounded arguments in dynamic().
# - Mixed: union the static result with the dynamic-wrapped dynamic result.
defp fun_apply_with_strategy(fun_static, fun_dynamic, arguments) do
args_domain = args_to_domain(arguments)
static? = fun_dynamic == nil and Enum.all?(arguments, fn arg -> not gradual?(arg) end)
arity = length(arguments)

if Enum.any?(arguments, &empty?/1) do
{:badarg, arguments, true}
else
arity = length(arguments)

with {:ok, domain, static_arrows, dynamic_arrows} <-
fun_normalize_both(fun_static, fun_dynamic, arity) do
args_domain = args_to_domain(arguments)
static? = fun_dynamic == nil and Enum.all?(arguments, fn arg -> not gradual?(arg) end)

cond do
# The domain here is the extended gradual domain computed by
# fun_normalize_both/3. If the argument does not satisfy it, we
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