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+" Test for lambda and closure
+
+func Test_lambda_feature()
+ call assert_equal(1, has('lambda'))
+endfunc
+
+func Test_lambda_with_filter()
+ let s:x = 2
+ call assert_equal([2, 3], filter([1, 2, 3], {i, v -> v >= s:x}))
+endfunc
+
+func Test_lambda_with_map()
+ let s:x = 1
+ call assert_equal([2, 3, 4], map([1, 2, 3], {i, v -> v + s:x}))
+endfunc
+
+func Test_lambda_with_sort()
+ call assert_equal([1, 2, 3, 4, 7], sort([3,7,2,1,4], {a, b -> a - b}))
+endfunc
+
+func Test_lambda_with_timer()
+ if !has('timers')
+ return
+ endif
+
+ let s:n = 0
+ let s:timer_id = 0
+ func! s:Foo()
+ "let n = 0
+ let s:timer_id = timer_start(50, {-> execute("let s:n += 1 | echo s:n", "")}, {"repeat": -1})
+ endfunc
+
+ call s:Foo()
+ sleep 200ms
+ " do not collect lambda
+ call test_garbagecollect_now()
+ let m = s:n
+ sleep 200ms
+ call timer_stop(s:timer_id)
+ call assert_true(m > 1)
+ call assert_true(s:n > m + 1)
+ call assert_true(s:n < 9)
+endfunc
+
+func Test_lambda_with_partial()
+ let l:Cb = function({... -> ['zero', a:1, a:2, a:3]}, ['one', 'two'])
+ call assert_equal(['zero', 'one', 'two', 'three'], l:Cb('three'))
+endfunc
+
+function Test_lambda_fails()
+ call assert_equal(3, {a, b -> a + b}(1, 2))
+ call assert_fails('echo {a, a -> a + a}(1, 2)', 'E853:')
+ call assert_fails('echo {a, b -> a + b)}(1, 2)', 'E15:')
+endfunc
+
+func Test_not_lamda()
+ let x = {'>' : 'foo'}
+ call assert_equal('foo', x['>'])
+endfunc
+
+func Test_lambda_capture_by_reference()
+ let v = 1
+ let l:F = {x -> x + v}
+ let v = 2
+ call assert_equal(12, l:F(10))
+endfunc
+
+func Test_lambda_side_effect()
+ func! s:update_and_return(arr)
+ let a:arr[1] = 5
+ return a:arr
+ endfunc
+
+ func! s:foo(arr)
+ return {-> s:update_and_return(a:arr)}
+ endfunc
+
+ let arr = [3,2,1]
+ call assert_equal([3, 5, 1], s:foo(arr)())
+endfunc
+
+func Test_lambda_refer_local_variable_from_other_scope()
+ func! s:foo(X)
+ return a:X() " refer l:x in s:bar()
+ endfunc
+
+ func! s:bar()
+ let x = 123
+ return s:foo({-> x})
+ endfunc
+
+ call assert_equal(123, s:bar())
+endfunc
+
+func Test_lambda_do_not_share_local_variable()
+ func! s:define_funcs()
+ let l:One = {-> split(execute("let a = 'abc' | echo a"))[0]}
+ let l:Two = {-> exists("a") ? a : "no"}
+ return [l:One, l:Two]
+ endfunc
+
+ let l:F = s:define_funcs()
+
+ call assert_equal('no', l:F[1]())
+ call assert_equal('abc', l:F[0]())
+ call assert_equal('no', l:F[1]())
+endfunc
+
+func Test_lambda_closure_counter()
+ func! s:foo()
+ let x = 0
+ return {-> [execute("let x += 1"), x][-1]}
+ endfunc
+
+ let l:F = s:foo()
+ call test_garbagecollect_now()
+ call assert_equal(1, l:F())
+ call assert_equal(2, l:F())
+ call assert_equal(3, l:F())
+ call assert_equal(4, l:F())
+endfunc
+
+func Test_lambda_with_a_var()
+ func! s:foo()
+ let x = 2
+ return {... -> a:000 + [x]}
+ endfunc
+ func! s:bar()
+ return s:foo()(1)
+ endfunc
+
+ call assert_equal([1, 2], s:bar())
+endfunc
+
+func Test_lambda_call_lambda_from_lambda()
+ func! s:foo(x)
+ let l:F1 = {-> {-> a:x}}
+ return {-> l:F1()}
+ endfunc
+
+ let l:F = s:foo(1)
+ call assert_equal(1, l:F()())
+endfunc
+
+func Test_lambda_delfunc()
+ func! s:gen()
+ let pl = l:
+ let l:Foo = {-> get(pl, "Foo", get(pl, "Bar", {-> 0}))}
+ let l:Bar = l:Foo
+ delfunction l:Foo
+ return l:Bar
+ endfunc
+
+ let l:F = s:gen()
+ call assert_fails(':call l:F()', 'E933:')
+endfunc
+
+func Test_lambda_scope()
+ func! s:NewCounter()
+ let c = 0
+ return {-> [execute('let c += 1'), c][-1]}
+ endfunc
+
+ func! s:NewCounter2()
+ return {-> [execute('let c += 100'), c][-1]}
+ endfunc
+
+ let l:C = s:NewCounter()
+ let l:D = s:NewCounter2()
+
+ call assert_equal(1, l:C())
+ call assert_fails(':call l:D()', 'E121:')
+ call assert_equal(2, l:C())
+endfunc
+
+func Test_lambda_share_scope()
+ func! s:New()
+ let c = 0
+ let l:Inc0 = {-> [execute('let c += 1'), c][-1]}
+ let l:Dec0 = {-> [execute('let c -= 1'), c][-1]}
+ return [l:Inc0, l:Dec0]
+ endfunc
+
+ let [l:Inc, l:Dec] = s:New()
+
+ call assert_equal(1, l:Inc())
+ call assert_equal(2, l:Inc())
+ call assert_equal(1, l:Dec())
+endfunc
+
+func Test_lambda_circular_reference()
+ func! s:Foo()
+ let d = {}
+ let d.f = {-> d}
+ return d.f
+ endfunc
+
+ call s:Foo()
+ call test_garbagecollect_now()
+ let i = 0 | while i < 10000 | call s:Foo() | let i+= 1 | endwhile
+ call test_garbagecollect_now()
+endfunc
+
+func Test_lambda_combination()
+ call assert_equal(2, {x -> {x -> x}}(1)(2))
+ call assert_equal(10, {y -> {x -> x(y)(10)}({y -> y})}({z -> z}))
+ call assert_equal(5.0, {x -> {y -> x / y}}(10)(2.0))
+ call assert_equal(6, {x -> {y -> {z -> x + y + z}}}(1)(2)(3))
+
+ call assert_equal(6, {x -> {f -> f(x)}}(3)({x -> x * 2}))
+ call assert_equal(6, {f -> {x -> f(x)}}({x -> x * 2})(3))
+
+ " Z combinator
+ let Z = {f -> {x -> f({y -> x(x)(y)})}({x -> f({y -> x(x)(y)})})}
+ let Fact = {f -> {x -> x == 0 ? 1 : x * f(x - 1)}}
+ call assert_equal(120, Z(Fact)(5))
+endfunc
+
+func Test_closure_counter()
+ func! s:foo()
+ let x = 0
+ func! s:bar() closure
+ let x += 1
+ return x
+ endfunc
+ return function('s:bar')
+ endfunc
+
+ let l:F = s:foo()
+ call test_garbagecollect_now()
+ call assert_equal(1, l:F())
+ call assert_equal(2, l:F())
+ call assert_equal(3, l:F())
+ call assert_equal(4, l:F())
+endfunc
+
+func Test_closure_unlet()
+ func! s:foo()
+ let x = 1
+ func! s:bar() closure
+ unlet x
+ endfunc
+ call s:bar()
+ return l:
+ endfunc
+
+ call assert_false(has_key(s:foo(), 'x'))
+ call test_garbagecollect_now()
+endfunc
+
+func LambdaFoo()
+ let x = 0
+ func! LambdaBar() closure
+ let x += 1
+ return x
+ endfunc
+ return function('LambdaBar')
+endfunc
+
+func Test_closure_refcount()
+ let g:Count = LambdaFoo()
+ call test_garbagecollect_now()
+ call assert_equal(1, g:Count())
+ let g:Count2 = LambdaFoo()
+ call test_garbagecollect_now()
+ call assert_equal(1, g:Count2())
+ call assert_equal(2, g:Count())
+ call assert_equal(3, g:Count2())
+
+ delfunc LambdaFoo
+ delfunc LambdaBar
+endfunc
+
+func Test_named_function_closure()
+ func! Afoo()
+ let x = 14
+ func! s:Abar() closure
+ return x
+ endfunc
+ call assert_equal(14, s:Abar())
+ endfunc
+ call Afoo()
+ call assert_equal(14, s:Abar())
+ call test_garbagecollect_now()
+ call assert_equal(14, s:Abar())
+endfunc
+
+func Test_lambda_with_index()
+ let List = {x -> [x]}
+ let Extract = {-> function(List, ['foobar'])()[0]}
+ call assert_equal('foobar', Extract())
+endfunc
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