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nate-chandlernate-chandler
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[stdlib] Collection types are eagerMove.
Types that have "value semantics" should not have lexical lifetimes. Value types are not expected to have custom deinits. Are not expected to expose unsafe interior pointers. And cannot have weak references because they are structs. Therefore, deinitialization barriers are irrelevant. rdar://107076869
1 parent 2e85960 commit d195ef0

18 files changed

+59
-87
lines changed

‎stdlib/public/core/Array.swift

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Original file line numberDiff line numberDiff line change
@@ -297,6 +297,7 @@
297297
/// instances of those types always have a contiguous block of memory as
298298
/// their storage.
299299
@frozen
300+
@_eagerMove
300301
public struct Array<Element>: _DestructorSafeContainer {
301302
#if _runtime(_ObjC)
302303
@usableFromInline

‎stdlib/public/core/ContiguousArray.swift

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@@ -34,6 +34,7 @@
3434
/// For more information about using arrays, see `Array` and `ArraySlice`, with
3535
/// which `ContiguousArray` shares most properties and methods.
3636
@frozen
37+
@_eagerMove
3738
public struct ContiguousArray<Element>: _DestructorSafeContainer {
3839
@usableFromInline
3940
internal typealias _Buffer = _ContiguousArrayBuffer<Element>

‎stdlib/public/core/Dictionary.swift

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@@ -386,6 +386,7 @@
386386
/// optimization that is used when two instances of `Dictionary` share
387387
/// buffer.
388388
@frozen
389+
@_eagerMove
389390
public struct Dictionary<Key: Hashable, Value> {
390391
/// The element type of a dictionary: a tuple containing an individual
391392
/// key-value pair.

‎stdlib/public/core/Set.swift

Lines changed: 1 addition & 0 deletions
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@@ -144,6 +144,7 @@
144144
/// same copy-on-write optimization that is used when two instances of `Set`
145145
/// share buffer.
146146
@frozen
147+
@_eagerMove
147148
public struct Set<Element: Hashable> {
148149
@usableFromInline
149150
internal var _variant: _Variant

‎stdlib/public/core/String.swift

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -349,6 +349,7 @@ internal func unimplemented_utf8_32bit(
349349
/// [scalars]: http://www.unicode.org/glossary/#unicode_scalar_value
350350
/// [equivalence]: http://www.unicode.org/glossary/#canonical_equivalent
351351
@frozen
352+
@_eagerMove
352353
public struct String {
353354
public // @SPI(Foundation)
354355
var _guts: _StringGuts

‎test/AutoDiff/SILOptimizer/activity_analysis.swift

Lines changed: 8 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -350,26 +350,26 @@ func testArrayUninitializedIntrinsicNested(_ x: Float, _ y: Float) -> [Float] {
350350
// CHECK: [ACTIVE] [[ARRAY:%.*]] = apply %14<Float>(%7) : $@convention(thin) <τ_0_0> (@owned Array<τ_0_0>) -> @owned Array<τ_0_0>
351351
// CHECK: [USEFUL] [[INT_LIT:%.*]] = integer_literal $Builtin.Word, 2
352352
// CHECK: [NONE] // function_ref _allocateUninitializedArray<A>(_:)
353-
// CHECK: [ACTIVE] [[TUP:%.*]] = apply %19<Float>([[INT_LIT]]) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
353+
// CHECK: [ACTIVE] [[TUP:%.*]] = apply %18<Float>([[INT_LIT]]) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
354354
// CHECK: [ACTIVE] (**[[LHS:%.*]]**, [[RHS:%.*]]) = destructure_tuple [[TUP]] : $(Array<Float>, Builtin.RawPointer)
355355
// CHECK: [VARIED] ([[LHS]], **[[RHS]]**) = destructure_tuple [[TUP]] : $(Array<Float>, Builtin.RawPointer)
356356
// CHECK: [ACTIVE] [[FLOAT_PTR:%.*]] = pointer_to_address [[RHS]] : $Builtin.RawPointer to [strict] $*Float
357357
// CHECK: [USEFUL] [[ZERO_LITERAL:%.*]] = integer_literal $Builtin.IntLiteral, 0
358358
// CHECK: [USEFUL] [[META:%.*]] = metatype $@thin Int.Type
359359
// CHECK: [NONE] // function_ref Int.init(_builtinIntegerLiteral:)
360-
// CHECK: [USEFUL] [[RESULT_2:%.*]] = apply %26([[ZERO_LITERAL]], [[META]]) : $@convention(method) (Builtin.IntLiteral, @thin Int.Type) -> Int
360+
// CHECK: [USEFUL] [[RESULT_2:%.*]] = apply %25([[ZERO_LITERAL]], [[META]]) : $@convention(method) (Builtin.IntLiteral, @thin Int.Type) -> Int
361361
// CHECK: [NONE] // function_ref Array.subscript.getter
362-
// CHECK: [NONE] %29 = apply %28<Float>([[FLOAT_PTR]], [[RESULT_2]], %16) : $@convention(method) <τ_0_0> (Int, @guaranteed Array<τ_0_0>) -> @out τ_0_0
362+
// CHECK: [NONE] %28 = apply %27<Float>([[FLOAT_PTR]], [[RESULT_2]], %15) : $@convention(method) <τ_0_0> (Int, @guaranteed Array<τ_0_0>) -> @out τ_0_0
363363
// CHECK: [VARIED] [[ONE_LITERAL:%.*]] = integer_literal $Builtin.Word, 1
364364
// CHECK: [ACTIVE] [[INDEX_ADDR:%.*]] = index_addr [[FLOAT_PTR]] : $*Float, [[ONE_LITERAL]] : $Builtin.Word
365365
// CHECK: [USEFUL] [[ONE_LITERAL_AGAIN:%.*]] = integer_literal $Builtin.IntLiteral, 1
366366
// CHECK: [USEFUL] [[META_AGAIN:%.*]] = metatype $@thin Int.Type
367367
// CHECK: [NONE] // function_ref Int.init(_builtinIntegerLiteral:)
368-
// CHECK: [USEFUL] %35 = apply %34([[ONE_LITERAL_AGAIN]], [[META_AGAIN]]) : $@convention(method) (Builtin.IntLiteral, @thin Int.Type) -> Int
368+
// CHECK: [USEFUL] %34 = apply %33([[ONE_LITERAL_AGAIN]], [[META_AGAIN]]) : $@convention(method) (Builtin.IntLiteral, @thin Int.Type) -> Int
369369
// CHECK: [NONE] // function_ref Array.subscript.getter
370-
// CHECK: [NONE] %37 = apply %36<Float>(%31, %35, %16) : $@convention(method) <τ_0_0> (Int, @guaranteed Array<τ_0_0>) -> @out τ_0_0
370+
// CHECK: [NONE] %36 = apply %35<Float>(%30, %34, %15) : $@convention(method) <τ_0_0> (Int, @guaranteed Array<τ_0_0>) -> @out τ_0_0
371371
// CHECK: [NONE] // function_ref _finalizeUninitializedArray<A>(_:)
372-
// CHECK: [ACTIVE] %39 = apply %38<Float>(%21) : $@convention(thin) <τ_0_0> (@owned Array<τ_0_0>) -> @owned Array<τ_0_0>
372+
// CHECK: [ACTIVE] %38 = apply %37<Float>(%20) : $@convention(thin) <τ_0_0> (@owned Array<τ_0_0>) -> @owned Array<τ_0_0>
373373

374374
// TF-978: Test array literal initialized with `apply` indirect results.
375375
struct Wrapper<T: Differentiable>: Differentiable {
@@ -617,7 +617,7 @@ func testBeginApplyActiveInoutArgument(array: [Float], x: Float) -> Float {
617617
// CHECK-LABEL: [AD] Activity info for ${{.*}}testBeginApplyActiveInoutArgument{{.*}} at parameter indices (0, 1) and result indices (0)
618618
// CHECK: [ACTIVE] %0 = argument of bb0 : $Array<Float>
619619
// CHECK: [ACTIVE] %1 = argument of bb0 : $Float
620-
// CHECK: [ACTIVE] %4 = alloc_stack [lexical] $Array<Float>, var, name "array"
620+
// CHECK: [ACTIVE] %4 = alloc_stack $Array<Float>, var, name "array"
621621
// CHECK: [ACTIVE] %5 = copy_value %0 : $Array<Float>
622622
// CHECK: [USEFUL] %7 = integer_literal $Builtin.IntLiteral, 0
623623
// CHECK: [USEFUL] %8 = metatype $@thin Int.Type
@@ -654,7 +654,7 @@ func testBeginApplyActiveButInitiallyNonactiveInoutArgument(x: Float) -> Float {
654654

655655
// CHECK-LABEL: [AD] Activity info for ${{.*}}testBeginApplyActiveButInitiallyNonactiveInoutArgument{{.*}} at parameter indices (0) and result indices (0)
656656
// CHECK: [ACTIVE] %0 = argument of bb0 : $Float
657-
// CHECK: [ACTIVE] %2 = alloc_stack [lexical] $Array<Float>, var, name "array"
657+
// CHECK: [ACTIVE] %2 = alloc_stack $Array<Float>, var, name "array"
658658
// CHECK: [USEFUL] %3 = integer_literal $Builtin.Word, 1
659659
// CHECK: [NONE] // function_ref _allocateUninitializedArray<A>(_:)
660660
// CHECK: [USEFUL] %5 = apply %4<Float>(%3) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)

‎test/AutoDiff/SILOptimizer/differentiation_diagnostics.swift

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -716,7 +716,7 @@ func modify(_ s: Struct, _ x: Float) -> Float {
716716
func tupleArrayLiteralInitialization(_ x: Float, _ y: Float) -> Float {
717717
// `Array<(Float, Float)>` does not conform to `Differentiable`.
718718
let array = [(x * y, x * y)]
719-
// expected-note @-1 {{cannot differentiate through a non-differentiable argument; do you want to use 'withoutDerivative(at:)'?}} {{7-7=withoutDerivative(at: }} {{12-12=)}}
719+
// expected-note @-1 {{cannot differentiate through a non-differentiable argument; do you want to use 'withoutDerivative(at:)'?}} {{15-15=withoutDerivative(at: }} {{31-31=)}}
720720
return array[0].0
721721
}
722722

‎test/SILGen/consuming_parameter.swift

Lines changed: 4 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -6,11 +6,10 @@ func bar(_: String) {}
66
func foo(y: consuming String, z: String) -> () -> String {
77
// CHECK: bb0(%0 : @owned $String, %1 : @guaranteed $String):
88
// CHECK: [[BOX:%.*]] = alloc_box ${ var String }
9-
// CHECK: [[BOX1:%.*]] = begin_borrow [lexical] [[BOX]]
10-
// CHECK: [[Y:%.*]] = project_box [[BOX1]]
9+
// CHECK: [[Y:%.*]] = project_box [[BOX]]
1110
// CHECK: store %0 to [init] [[Y]]
1211

13-
// CHECK: [[YCAPTURE:%.*]] = copy_value [[BOX1]]
12+
// CHECK: [[YCAPTURE:%.*]] = copy_value [[BOX]]
1413
// CHECK: partial_apply {{.*}} {{%.*}}([[YCAPTURE]])
1514
let r = { y }
1615

@@ -36,11 +35,10 @@ struct Butt {
3635
consuming func merged(with other: Butt) -> () -> Butt {
3736
// CHECK: bb0(%0 : @guaranteed $Butt, %1 : @owned $Butt):
3837
// CHECK: [[BOX:%.*]] = alloc_box ${ var Butt }
39-
// CHECK: [[BOX1:%.*]] = begin_borrow [lexical] [[BOX]]
40-
// CHECK: [[SELF:%.*]] = project_box [[BOX1]]
38+
// CHECK: [[SELF:%.*]] = project_box [[BOX]]
4139
// CHECK: store %1 to [init] [[SELF]]
4240

43-
// CHECK: [[SELFCAPTURE:%.*]] = copy_value [[BOX1]]
41+
// CHECK: [[SELFCAPTURE:%.*]] = copy_value [[BOX]]
4442
// CHECK: partial_apply {{.*}} {{%.*}}([[SELFCAPTURE]])
4543
let r = { self }
4644

‎test/SILGen/foreach.swift

Lines changed: 4 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -53,8 +53,7 @@ protocol GenericCollection : Collection {
5353
// CHECK-LABEL: sil hidden [ossa] @$s7foreach13trivialStructyySaySiGF : $@convention(thin) (@guaranteed Array<Int>) -> () {
5454
// CHECK: bb0([[ARRAY:%.*]] : @guaranteed $Array<Int>):
5555
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box ${ var IndexingIterator<Array<Int>> }, var, name "$x$generator"
56-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
57-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
56+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
5857
// CHECK: br [[LOOP_DEST:bb[0-9]+]]
5958
//
6059
// CHECK: [[LOOP_DEST]]:
@@ -66,7 +65,6 @@ protocol GenericCollection : Collection {
6665
// CHECK: br [[LOOP_DEST]]
6766
//
6867
// CHECK: [[NONE_BB]]:
69-
// CHECK: end_borrow [[ITERATOR_LIFETIME]]
7068
// CHECK: destroy_value [[ITERATOR_BOX]]
7169
// CHECK: [[FUNC_END_FUNC:%.*]] = function_ref @funcEnd : $@convention(thin) () -> ()
7270
// CHECK: apply [[FUNC_END_FUNC]]()
@@ -107,8 +105,7 @@ func trivialStructBreak(_ xx: [Int]) {
107105
// CHECK-LABEL: sil hidden [ossa] @$s7foreach26trivialStructContinueBreakyySaySiGF : $@convention(thin) (@guaranteed Array<Int>) -> () {
108106
// CHECK: bb0([[ARRAY:%.*]] : @guaranteed $Array<Int>):
109107
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box ${ var IndexingIterator<Array<Int>> }, var, name "$x$generator"
110-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
111-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
108+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
112109
// CHECK: [[BORROWED_ARRAY_STACK:%.*]] = alloc_stack $Array<Int>
113110
// CHECK: store [[ARRAY_COPY:%.*]] to [init] [[BORROWED_ARRAY_STACK]]
114111
// CHECK: [[MAKE_ITERATOR_FUNC:%.*]] = function_ref @$sSlss16IndexingIteratorVyxG0B0RtzrlE04makeB0ACyF : $@convention(method) <τ_0_0 where τ_0_0 : Collection, τ_0_0.Iterator == IndexingIterator<τ_0_0>> (@in τ_0_0) -> @out IndexingIterator<τ_0_0>
@@ -148,7 +145,6 @@ func trivialStructBreak(_ xx: [Int]) {
148145
// CHECK: br [[CONT_BLOCK]]
149146
//
150147
// CHECK: [[CONT_BLOCK]]
151-
// CHECK: end_borrow [[ITERATOR_LIFETIME]]
152148
// CHECK: destroy_value [[ITERATOR_BOX]] : ${ var IndexingIterator<Array<Int>> }
153149
// CHECK: [[FUNC_END_FUNC:%.*]] = function_ref @funcEnd : $@convention(thin) () -> ()
154150
// CHECK: apply [[FUNC_END_FUNC]]()
@@ -209,8 +205,7 @@ func existentialBreak(_ xx: [P]) {
209205
// CHECK-LABEL: sil hidden [ossa] @$s7foreach24existentialContinueBreakyySayAA1P_pGF : $@convention(thin) (@guaranteed Array<any P>) -> () {
210206
// CHECK: bb0([[ARRAY:%.*]] : @guaranteed $Array<any P>):
211207
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box ${ var IndexingIterator<Array<any P>> }, var, name "$x$generator"
212-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
213-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
208+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
214209
// CHECK: [[BORROWED_ARRAY_STACK:%.*]] = alloc_stack $Array<any P>
215210
// CHECK: store [[ARRAY_COPY:%.*]] to [init] [[BORROWED_ARRAY_STACK]]
216211
// CHECK: [[MAKE_ITERATOR_FUNC:%.*]] = function_ref @$sSlss16IndexingIteratorVyxG0B0RtzrlE04makeB0ACyF : $@convention(method) <τ_0_0 where τ_0_0 : Collection, τ_0_0.Iterator == IndexingIterator<τ_0_0>> (@in τ_0_0) -> @out IndexingIterator<τ_0_0>
@@ -259,7 +254,6 @@ func existentialBreak(_ xx: [P]) {
259254
//
260255
// CHECK: [[CONT_BLOCK]]
261256
// CHECK: dealloc_stack [[ELT_STACK]]
262-
// CHECK: end_borrow [[ITERATOR_LIFETIME]]
263257
// CHECK: destroy_value [[ITERATOR_BOX]] : ${ var IndexingIterator<Array<any P>> }
264258
// CHECK: [[FUNC_END_FUNC:%.*]] = function_ref @funcEnd : $@convention(thin) () -> ()
265259
// CHECK: apply [[FUNC_END_FUNC]]()
@@ -371,8 +365,7 @@ func genericStructBreak<T>(_ xx: [GenericStruct<T>]) {
371365
// CHECK-LABEL: sil hidden [ossa] @$s7foreach26genericStructContinueBreakyySayAA07GenericC0VyxGGlF : $@convention(thin) <T> (@guaranteed Array<GenericStruct<T>>) -> () {
372366
// CHECK: bb0([[ARRAY:%.*]] : @guaranteed $Array<GenericStruct<T>>):
373367
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box $<τ_0_0> { var IndexingIterator<Array<GenericStruct<τ_0_0>>> } <T>, var, name "$x$generator"
374-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
375-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
368+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
376369
// CHECK: [[BORROWED_ARRAY_STACK:%.*]] = alloc_stack $Array<GenericStruct<T>>
377370
// CHECK: store [[ARRAY_COPY:%.*]] to [init] [[BORROWED_ARRAY_STACK]]
378371
// CHECK: [[MAKE_ITERATOR_FUNC:%.*]] = function_ref @$sSlss16IndexingIteratorVyxG0B0RtzrlE04makeB0ACyF : $@convention(method) <τ_0_0 where τ_0_0 : Collection, τ_0_0.Iterator == IndexingIterator<τ_0_0>> (@in τ_0_0) -> @out IndexingIterator<τ_0_0>
@@ -421,7 +414,6 @@ func genericStructBreak<T>(_ xx: [GenericStruct<T>]) {
421414
//
422415
// CHECK: [[CONT_BLOCK]]
423416
// CHECK: dealloc_stack [[ELT_STACK]]
424-
// CHECK: end_borrow [[ITERATOR_LIFETIME]]
425417
// CHECK: destroy_value [[ITERATOR_BOX]]
426418
// CHECK: [[FUNC_END_FUNC:%.*]] = function_ref @funcEnd : $@convention(thin) () -> ()
427419
// CHECK: apply [[FUNC_END_FUNC]]()

‎test/SILGen/foreach_async.swift

Lines changed: 3 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -74,8 +74,7 @@ struct AsyncLazySequence<S: Sequence>: AsyncSequence {
7474
// CHECK-LABEL: sil hidden [ossa] @$s13foreach_async13trivialStructyyAA17AsyncLazySequenceVySaySiGGYaF : $@convention(thin) @async (@guaranteed AsyncLazySequence<Array<Int>>) -> () {
7575
// CHECK: bb0([[SOURCE:%.*]] : @guaranteed $AsyncLazySequence<Array<Int>>):
7676
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box ${ var AsyncLazySequence<Array<Int>>.Iterator }, var, name "$x$generator"
77-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
78-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
77+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
7978
// CHECK: br [[LOOP_DEST:bb[0-9]+]]
8079

8180
// CHECK: [[LOOP_DEST]]:
@@ -104,8 +103,7 @@ func trivialStruct(_ xx: AsyncLazySequence<[Int]>) async {
104103
// CHECK-LABEL: sil hidden [ossa] @$s13foreach_async21trivialStructContinueyyAA17AsyncLazySequenceVySaySiGGYaF : $@convention(thin) @async (@guaranteed AsyncLazySequence<Array<Int>>) -> () {
105104
// CHECK: bb0([[SOURCE:%.*]] : @guaranteed $AsyncLazySequence<Array<Int>>):
106105
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box ${ var AsyncLazySequence<Array<Int>>.Iterator }, var, name "$x$generator"
107-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
108-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
106+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
109107
// CHECK: br [[LOOP_DEST:bb[0-9]+]]
110108

111109
// CHECK: [[LOOP_DEST]]:
@@ -161,8 +159,7 @@ func trivialStructBreak(_ xx: AsyncLazySequence<[Int]>) async {
161159
// CHECK-LABEL: sil hidden [ossa] @$s13foreach_async26trivialStructContinueBreakyyAA17AsyncLazySequenceVySaySiGGYaF : $@convention(thin) @async (@guaranteed AsyncLazySequence<Array<Int>>) -> ()
162160
// CHECK: bb0([[SOURCE:%.*]] : @guaranteed $AsyncLazySequence<Array<Int>>):
163161
// CHECK: [[ITERATOR_BOX:%.*]] = alloc_box ${ var AsyncLazySequence<Array<Int>>.Iterator }, var, name "$x$generator"
164-
// CHECK: [[ITERATOR_LIFETIME:%[^,]+]] = begin_borrow [lexical] [[ITERATOR_BOX]]
165-
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_LIFETIME]]
162+
// CHECK: [[PROJECT_ITERATOR_BOX:%.*]] = project_box [[ITERATOR_BOX]]
166163
// CHECK: br [[LOOP_DEST:bb[0-9]+]]
167164

168165
// CHECK: [[LOOP_DEST]]:

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