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Add signature for Enumerator#+ #2567

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Merged
ksss merged 1 commit into from
Jun 27, 2025
Merged

Add signature for Enumerator#+ #2567

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12 changes: 12 additions & 0 deletions core/enumerator.rbs
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Original file line number Diff line number Diff line change
Expand Up @@ -448,6 +448,18 @@ class Enumerator[unchecked out Elem, out Return = void] < Object
#
def size: () -> (Integer | Float)?

# <!--
# rdoc-file=enumerator.c
# - e + enum -> enumerator
# -->
# Returns an enumerator object generated from this enumerator and a given
# enumerable.
#
# e = (1..3).each + [4, 5]
# e.to_a #=> [1, 2, 3, 4, 5]
#
def +: [Elem2] (::_Each[Elem2]) -> ::Enumerator::Chain[Elem | Elem2]

# <!--
# rdoc-file=enumerator.c
# - e.with_index(offset = 0) {|(*args), idx| ... }
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4 changes: 4 additions & 0 deletions test/stdlib/Enumerator_test.rb
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Expand Up @@ -24,6 +24,10 @@ def test_each
assert_send_type "() { (Integer) -> nil } -> [1,2,3]",
enum, :each do end
end

def test_plus
assert_send_type "(Array[Integer]) -> Enumerator::Chain[Integer]", (1..3).each, :+, [4, 5]
end
end

class EnumeratorSingletonTest < Test::Unit::TestCase
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