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Build Information

Successful build of mlx-swift, reference main (49d73a), with Swift 6.0 for macOS (SPM) on 18 Apr 2026 14:49:40 UTC.

Swift 6 data race errors: 0

Build Command

env DEVELOPER_DIR=/Applications/Xcode-16.2.0.app xcrun swift build --arch arm64

Build Log

========================================
RunAll
========================================
Builder version: 4.70.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/ml-explore/mlx-swift.git
Reference: main
Initialized empty Git repository in /Users/admin/builder/spi-builder-workspace/.git/
From https://github.com/ml-explore/mlx-swift
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at 49d73ab add missing functions (#387)
Submodule path 'Source/Cmlx/mlx': checked out 'ce45c52505c8158ea48d2a54e8caae05efd86bfe'
Submodule path 'Source/Cmlx/mlx-c': checked out '0726ca922fc902c4c61ef9c27d94132be418e945'
Submodule 'submodules/mlx' (https://github.com/ml-explore/mlx) registered for path 'Source/Cmlx/mlx'
Submodule 'submodules/mlx-c' (https://github.com/ml-explore/mlx-c) registered for path 'Source/Cmlx/mlx-c'
Cloning into '/Users/admin/builder/spi-builder-workspace/Source/Cmlx/mlx'...
Cloning into '/Users/admin/builder/spi-builder-workspace/Source/Cmlx/mlx-c'...
Cloned https://github.com/ml-explore/mlx-swift.git
Revision (git rev-parse @):
49d73abcbe8f49f44c1e61911997e6b680484216
SPI manifest file found: $PWD/.spi.yml
SUCCESS checkout https://github.com/ml-explore/mlx-swift.git at main
========================================
Build
========================================
Selected platform:         macosSpm
Swift version:             6.0
Building package at path:  $PWD
https://github.com/ml-explore/mlx-swift.git
Running build ...
env DEVELOPER_DIR=/Applications/Xcode-16.2.0.app xcrun swift build --arch arm64
Building for debugging...
[0/211] Write swift-version-5BDAB9E9C0126B9D.txt
[1/211] Compiling _NumericsShims _NumericsShims.c
[2/211] Write sources
[3/211] Write Tutorial-entitlement.plist
[4/211] Write sources
[7/222] Compiling RealModule RealFunctions.swift
[8/223] Compiling RealModule Float80+Real.swift
[9/223] Compiling RealModule Real.swift
[10/223] Emitting module RealModule
[11/223] Compiling RealModule Float16+Real.swift
[12/223] Compiling RealModule ElementaryFunctions.swift
[13/223] Compiling RealModule Double+Real.swift
[14/223] Compiling RealModule AlgebraicField.swift
[15/223] Compiling RealModule ApproximateEquality.swift
[16/223] Compiling RealModule Float+Real.swift
[17/223] Compiling RealModule AugmentedArithmetic.swift
[18/223] Compiling RealModule RelaxedArithmetic.swift
[18/223] Write sources
[26/223] Write Example1-entitlement.plist
[27/223] Write sources
[28/223] Write CustomFunctionExampleSimple-entitlement.plist
[29/223] Write sources
[30/223] Write CustomFunctionExample-entitlement.plist
[31/223] Write sources
[32/223] Compiling version.cpp
[34/234] Compiling ComplexModule Polar.swift
[35/235] Compiling ComplexModule Complex+IntegerLiteral.swift
[36/235] Compiling ComplexModule Complex+Numeric.swift
[37/235] Compiling ComplexModule Complex+Hashable.swift
[38/235] Compiling ComplexModule Complex+StringConvertible.swift
[39/235] Compiling ComplexModule Complex.swift
[40/235] Compiling ComplexModule Scale.swift
[41/235] Compiling ComplexModule Complex+Codable.swift
[42/235] Compiling ComplexModule Complex+AdditiveArithmetic.swift
[43/235] Compiling ComplexModule Complex+AlgebraicField.swift
[44/235] Compiling ComplexModule Complex+ElementaryFunctions.swift
[45/235] Emitting module ComplexModule
[45/235] Compiling format.cc
[46/235] Compiling slicing.cpp
[48/237] Emitting module Numerics
[49/237] Compiling Numerics Numerics.swift
[49/237] Compiling cuda.cpp
[50/237] Compiling compile.cpp
[51/237] Compiling device.cpp
[52/237] Compiling allocator.cpp
[53/237] Compiling utils.cpp
[54/237] Compiling array.cpp
[55/237] Compiling closure.cpp
[56/237] Compiling Cmlx.m
[57/237] Compiling scheduler.cpp
[58/237] Compiling no_gguf.cpp
[59/237] Compiling random.cpp
[60/237] Compiling linalg.cpp
[61/237] Compiling graph_utils.cpp
[62/237] Compiling load.cpp
[63/237] Compiling fft.cpp
[64/237] Compiling primitives.cpp
[65/237] Compiling dtype.cpp
[66/237] Compiling transforms.cpp
[67/237] Compiling dtype_utils.cpp
[68/237] Compiling utils.cpp
[69/237] Compiling safetensors.cpp
[70/237] Compiling no_ring.cpp
[71/237] Compiling einsum.cpp
[72/237] Compiling no_nccl.cpp
[73/237] Compiling no_mpi.cpp
[74/237] Compiling fast.cpp
[75/237] Compiling device.cpp
[76/237] Compiling no_jaccl.cpp
[77/237] Compiling primitives.cpp
[78/237] Compiling ops.cpp
[79/237] Compiling distributed.cpp
[80/237] Compiling ops.cpp
[81/237] Compiling utils.cpp
[82/237] Compiling unary.cpp
[83/237] Compiling softmax.cpp
[84/237] Compiling sort.cpp
[85/237] Compiling ternary.cpp
[86/237] Compiling slicing.cpp
[87/237] Compiling scan.cpp
[88/237] Compiling scaled_dot_product_attention.cpp
[89/237] Compiling compile.cpp
[90/237] Compiling resident.cpp
[91/237] Compiling rope.cpp
[92/237] Compiling metal.cpp
[93/237] Compiling reduce.cpp
[94/237] Compiling primitives.cpp
[95/237] Compiling normalization.cpp
[96/237] Compiling quantized.cpp
[97/237] Compiling logsumexp.cpp
[98/237] Compiling matmul.cpp
[99/237] Compiling event.cpp
[100/237] Compiling indexing.cpp
[101/237] Compiling fence.cpp
[102/237] Compiling hadamard.cpp
[103/237] Compiling eval.cpp
[104/237] Compiling distributed.cpp
[105/237] Compiling device_info.cpp
[106/237] Compiling jit_kernels.cpp
[107/237] Compiling fft.cpp
[108/237] Compiling primitives.cpp
[109/237] Compiling copy.cpp
[110/237] Compiling no_cuda.cpp
[111/237] Compiling copy.cpp
[112/237] Compiling threefry.cpp
[113/237] Compiling conv.cpp
[114/237] Compiling compiled.cpp
[115/237] Compiling binary.cpp
[116/237] Compiling device.cpp
[117/237] Compiling export.cpp
[118/237] Compiling custom_kernel.cpp
[119/237] Compiling select.cpp
[120/237] Compiling softmax.cpp
[121/237] Compiling svd.cpp
[122/237] Compiling scan.cpp
[123/237] Compiling qrf.cpp
[124/237] Compiling sort.cpp
[125/237] Compiling quantized.cpp
[126/237] Compiling jit_compiler.cpp
[127/237] Compiling primitives.cpp
[128/237] Compiling matmul.cpp
[129/237] Compiling logsumexp.cpp
[130/237] Compiling luf.cpp
[131/237] Compiling masked_mm.cpp
[132/237] Compiling hadamard.cpp
[133/237] Compiling inverse.cpp
[134/237] Compiling cblas.cpp
[135/237] Compiling encoder.cpp
[136/237] Compiling unary.cpp
[137/237] Compiling eval.cpp
[138/237] Compiling bnns.cpp
[139/237] Compiling device_info.cpp
[140/237] Compiling distributed.cpp
[141/237] Compiling fft.cpp
[142/237] Compiling indexing.cpp
[143/237] Compiling eigh.cpp
[144/237] Compiling eig.cpp
[145/237] Compiling utils.cpp
[146/237] Compiling cholesky.cpp
[147/237] Compiling arg_reduce.cpp
[148/237] Compiling slicing.cpp
[149/237] Compiling reduce.cpp
[150/237] Compiling utils.cpp
[151/237] Compiling unary_ops.cpp
[152/237] Compiling unary.cpp
[153/237] Compiling ternary_ops.cpp
[154/237] Compiling ternary.cpp
[155/237] Compiling steel_gemm_splitk_nax.cpp
[156/237] Compiling steel_gemm_splitk.cpp
[157/237] Compiling steel_gemm_segmented.cpp
[158/237] Compiling steel_gemm_masked.cpp
[159/237] Compiling steel_gemm_gather_nax.cpp
[160/237] Compiling steel_gemm_gather.cpp
[161/237] Compiling steel_gemm_fused_nax.cpp
[162/237] Compiling load.cpp
[163/237] Compiling steel_gemm_fused.cpp
[164/237] Compiling steel_conv_general.cpp
[165/237] Compiling steel_conv_3d.cpp
[166/237] Compiling compiled.cpp
[167/237] Compiling steel_conv.cpp
[168/237] Compiling steel_attention_nax.cpp
[169/237] Compiling broadcasting.cpp
[170/237] Compiling steel_attention.cpp
[171/237] Compiling sort.cpp
[172/237] Compiling softmax.cpp
[173/237] Compiling scatter_axis.cpp
[174/237] Compiling scatter.cpp
[175/237] Compiling scan.cpp
[176/237] Compiling reduce_utils.cpp
[177/237] Compiling reduce.cpp
[178/237] Compiling quantized_utils.cpp
[179/237] Compiling conv.cpp
[180/237] Compiling quantized_nax.cpp
[181/237] Compiling masked_scatter.cpp
[182/237] Compiling quantized.cpp
[183/237] Compiling hadamard.cpp
[184/237] Compiling logsumexp.cpp
[185/237] Compiling gemv_masked.cpp
[186/237] Compiling gemm_nax.cpp
[187/237] Compiling gemm.cpp
[188/237] Compiling gather_front.cpp
[189/237] Compiling gather_axis.cpp
[190/237] Compiling gather.cpp
[191/237] Compiling fp_quantized.cpp
[191/237] Compiling fp_quantized_nax.cpp
[193/237] Compiling copy.cpp
[194/237] Compiling fft.cpp
[195/237] Compiling conv.cpp
[196/237] Compiling binary_two.cpp
[197/237] Compiling compiled_preamble.cpp
[198/237] Compiling binary_ops.cpp
[199/237] Compiling binary.cpp
[200/237] Compiling arange.cpp
[201/237] Compiling common.cpp
[202/237] Compiling copy.cpp
[203/237] Compiling array.cpp
[204/237] Compiling version.cpp
[205/237] Compiling reduce.cpp
[206/237] Compiling string.cpp
[207/237] Compiling transforms_impl.cpp
[208/237] Compiling transforms.cpp
[209/237] Compiling vector.cpp
[210/237] Compiling stream.cpp
[211/237] Compiling compiled_conditional.cpp
[212/237] Compiling random.cpp
[213/237] Compiling metal.cpp
[214/237] Compiling memory.cpp
[215/237] Compiling linalg.cpp
[216/237] Compiling map.cpp
[217/237] Compiling io_types.cpp
[218/237] Compiling ops.cpp
[219/237] Compiling io.cpp
[220/237] Compiling error.cpp
[221/237] Compiling fft.cpp
[222/237] Compiling fast.cpp
[223/237] Compiling export.cpp
[224/237] Compiling binary.cpp
[226/274] Emitting module MLX
[227/277] Compiling MLX Transforms+Vmap.swift
[228/277] Compiling MLX Transforms.swift
[229/277] Compiling MLX WiredMemory.swift
[230/277] Compiling MLX ArrayAt.swift
[231/277] Compiling MLX Cmlx+Util.swift
[232/277] Compiling MLX DType.swift
[233/277] Compiling MLX Device.swift
[234/277] Compiling MLX MLXFast.swift
[235/277] Compiling MLX MLXFastKernel.swift
[236/277] Compiling MLX Memory.swift
[237/277] Compiling MLX Nested.swift
[238/277] Compiling MLX MLXArray+Normalizer.swift
[239/277] Compiling MLX MLXArray+Ops.swift
[240/277] Compiling MLX MLXArray.swift
[241/277] Compiling MLX MLXCustomFunction.swift
[242/277] Compiling MLX Ops+Array.swift
[243/277] Compiling MLX Ops.swift
[244/277] Compiling MLX ParameterTypes.swift
[245/277] Compiling MLX Protocols.swift
[246/277] Compiling MLX Transforms+CompileOverloads.swift
[247/277] Compiling MLX Transforms+Eval.swift
[248/277] Compiling MLX Transforms+Grad.swift
[249/277] Compiling MLX Transforms+Internal.swift
[250/277] Compiling MLX Foundation+Util.swift
[251/277] Compiling MLX GPU+Metal.swift
[252/277] Compiling MLX IO.swift
[253/277] Compiling MLX Linalg.swift
[254/277] Compiling MLX ErrorHandler.swift
[255/277] Compiling MLX Export.swift
[256/277] Compiling MLX FFT.swift
[257/277] Compiling MLX Factory.swift
[258/277] Compiling MLX MLXArray+Bytes.swift
[259/277] Compiling MLX MLXArray+Indexing.swift
[260/277] Compiling MLX MLXArray+Init.swift
[261/277] Compiling MLX MLXArray+Metal.swift
[262/277] Compiling MLX Random.swift
[263/277] Compiling MLX State.swift
[264/277] Compiling MLX Stream.swift
[265/277] Compiling MLX Transforms+Compile.swift
[266/312] Compiling MLXRandom Random.swift
[267/312] Compiling MLXFFT FFT.swift
[268/312] Emitting module MLXFFT
[269/312] Compiling MLXFast MLXFast.swift
[270/312] Emitting module MLXFast
[271/312] Compiling MLXFast MLXFastKernel.swift
[272/312] Emitting module MLXLinalg
[273/312] Compiling MLXLinalg Linalg.swift
[274/312] Emitting module MLXRandom
[275/312] Emitting module Example1
[276/312] Compiling Example1 Example1.swift
[276/312] Write Objects.LinkFileList
[278/312] Compiling CustomFunctionExampleSimple CustomFunctionExampleSimple.swift
[279/312] Emitting module CustomFunctionExampleSimple
[279/312] Write Objects.LinkFileList
[281/312] Compiling Tutorial Tutorial.swift
[282/312] Emitting module Tutorial
[282/312] Write Objects.LinkFileList
[284/312] Emitting module CustomFunctionExample
[285/312] Compiling CustomFunctionExample CustomFunctionExample.swift
[285/312] Write Objects.LinkFileList
[287/312] Compiling MLXNN Containers.swift
[288/312] Compiling MLXNN Convolution.swift
[289/313] Compiling MLXNN ValueAndGrad.swift
[290/313] Compiling MLXNN PositionalEncoding.swift
[291/313] Compiling MLXNN Quantized.swift
[292/313] Compiling MLXNN Normalization.swift
[293/313] Compiling MLXNN Pooling.swift
[294/313] Compiling MLXNN Activations.swift
[295/313] Compiling MLXNN Cache.swift
[296/313] Compiling MLXNN Embedding.swift
[297/313] Compiling MLXNN Linear.swift
[298/313] Compiling MLXNN ConvolutionTransposed.swift
[299/313] Compiling MLXNN Dropout.swift
[300/313] Compiling MLXNN Losses.swift
/Users/admin/builder/spi-builder-workspace/Source/MLXNN/Module.swift:1411:34: warning: conditional downcast from 'T?' to 'T' does nothing
1409 |             // note: this gives a warning but it does in fact do something
1410 |             // in the case where this is e.g. ParameterInfo<MLXArray?>
1411 |             if let value = value as? T {
     |                                  `- warning: conditional downcast from 'T?' to 'T' does nothing
1412 |                 return value
1413 |             } else {
/Users/admin/builder/spi-builder-workspace/Source/MLXNN/Module.swift:1524:36: warning: conditional downcast from 'T?' to 'T' does nothing
1522 |             // note: this gives a warning but it does in fact do something
1523 |             // in the case where this is e.g. ModuleInfo<Linear?>
1524 |             if let module = module as? T {
     |                                    `- warning: conditional downcast from 'T?' to 'T' does nothing
1525 |                 return module
1526 |             } else {
/Users/admin/builder/spi-builder-workspace/Source/MLXNN/Module.swift:293:13: warning: default will never be executed
 291 |                 return isAllNone ? .none : .array(result)
 292 |
 293 |             default:
     |             `- warning: default will never be executed
 294 |                 fatalError("Unexpected leaf \(vk) = \(v)")
 295 |             }
[301/313] Compiling MLXNN Module.swift
/Users/admin/builder/spi-builder-workspace/Source/MLXNN/Module.swift:1411:34: warning: conditional downcast from 'T?' to 'T' does nothing
1409 |             // note: this gives a warning but it does in fact do something
1410 |             // in the case where this is e.g. ParameterInfo<MLXArray?>
1411 |             if let value = value as? T {
     |                                  `- warning: conditional downcast from 'T?' to 'T' does nothing
1412 |                 return value
1413 |             } else {
/Users/admin/builder/spi-builder-workspace/Source/MLXNN/Module.swift:1524:36: warning: conditional downcast from 'T?' to 'T' does nothing
1522 |             // note: this gives a warning but it does in fact do something
1523 |             // in the case where this is e.g. ModuleInfo<Linear?>
1524 |             if let module = module as? T {
     |                                    `- warning: conditional downcast from 'T?' to 'T' does nothing
1525 |                 return module
1526 |             } else {
/Users/admin/builder/spi-builder-workspace/Source/MLXNN/Module.swift:293:13: warning: default will never be executed
 291 |                 return isAllNone ? .none : .array(result)
 292 |
 293 |             default:
     |             `- warning: default will never be executed
 294 |                 fatalError("Unexpected leaf \(vk) = \(v)")
 295 |             }
[302/313] Compiling MLXNN Recurrent.swift
[303/313] Compiling MLXNN Transformer.swift
[304/313] Compiling MLXNN Upsample.swift
[305/313] Emitting module MLXNN
[306/315] Emitting module MLXOptimizers
[307/315] Compiling MLXOptimizers Optimizers.swift
[307/315] Linking CustomFunctionExampleSimple
[308/315] Linking Tutorial
[309/315] Linking CustomFunctionExample
[310/315] Linking Example1
[311/315] Applying CustomFunctionExampleSimple
[312/315] Applying Tutorial
[313/315] Applying CustomFunctionExample
[314/315] Applying Example1
Build complete! (44.10s)
Fetching https://github.com/apple/swift-numerics
[1/6416] Fetching swift-numerics
Fetched https://github.com/apple/swift-numerics from cache (1.23s)
Computing version for https://github.com/apple/swift-numerics
Computed https://github.com/apple/swift-numerics at 1.1.1 (0.43s)
Creating working copy for https://github.com/apple/swift-numerics
Working copy of https://github.com/apple/swift-numerics resolved at 1.1.1
warning: 'spi-builder-workspace': found 3 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/Source/Examples/CustomFunctionExample.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/Example1.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/CustomFunctionExampleSimple.swift
warning: 'spi-builder-workspace': found 3 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/Source/Examples/CustomFunctionExample.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/Tutorial.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/CustomFunctionExampleSimple.swift
warning: 'spi-builder-workspace': found 3 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/Source/Examples/CustomFunctionExample.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/Tutorial.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/Example1.swift
warning: 'spi-builder-workspace': found 3 file(s) which are unhandled; explicitly declare them as resources or exclude from the target
    /Users/admin/builder/spi-builder-workspace/Source/Examples/Tutorial.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/Example1.swift
    /Users/admin/builder/spi-builder-workspace/Source/Examples/CustomFunctionExampleSimple.swift
Build complete.
{
  "cxx_language_standard" : "gnu++20",
  "dependencies" : [
    {
      "identity" : "swift-numerics",
      "requirement" : {
        "range" : [
          {
            "lower_bound" : "1.0.0",
            "upper_bound" : "2.0.0"
          }
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    }
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  "platforms" : [
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    {
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      "type" : {
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    {
      "name" : "MLXLinalg",
      "targets" : [
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    {
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    {
      "name" : "Tutorial",
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    {
      "name" : "Example1",
      "targets" : [
        "Example1"
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      "type" : {
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    },
    {
      "name" : "CustomFunctionExampleSimple",
      "targets" : [
        "CustomFunctionExampleSimple"
      ],
      "type" : {
        "executable" : null
      }
    },
    {
      "name" : "CustomFunctionExample",
      "targets" : [
        "CustomFunctionExample"
      ],
      "type" : {
        "executable" : null
      }
    }
  ],
  "targets" : [
    {
      "c99name" : "Tutorial",
      "module_type" : "SwiftTarget",
      "name" : "Tutorial",
      "path" : "Source/Examples",
      "product_memberships" : [
        "Tutorial"
      ],
      "sources" : [
        "Tutorial.swift"
      ],
      "target_dependencies" : [
        "MLX"
      ],
      "type" : "executable"
    },
    {
      "c99name" : "MLXTests",
      "module_type" : "SwiftTarget",
      "name" : "MLXTests",
      "path" : "Tests/MLXTests",
      "sources" : [
        "ArrayAtTests.swift",
        "DTypeTests.swift",
        "ErrorTests.swift",
        "ExportTests.swift",
        "IntegrationTests.swift",
        "LinalgTests.swift",
        "LossTests.swift",
        "MLXArray+IndexingTests.swift",
        "MLXArray+InitTests.swift",
        "MLXArray+NormlizerTests.swift",
        "MLXArray+OpsTests.swift",
        "MLXArrayTests.swift",
        "MLXFastKernelTests.swift",
        "MLXRandomTests.swift",
        "MemoryTests.swift",
        "ModuleTests.swift",
        "NestedTests.swift",
        "OpsTests.swift",
        "OptimizerTests.swift",
        "PoolingTests.swift",
        "QuantizationTests.swift",
        "SaveTests.swift",
        "StreamTests.swift",
        "SubclassTests.swift",
        "TransformTests.swift",
        "UpsampleTests.swift",
        "Utils.swift",
        "WiredMemoryTests.swift"
      ],
      "target_dependencies" : [
        "MLX",
        "MLXNN",
        "MLXOptimizers"
      ],
      "type" : "test"
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    {
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      "module_type" : "SwiftTarget",
      "name" : "MLXRandom",
      "path" : "Source/MLXRandom",
      "product_memberships" : [
        "MLXRandom"
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        "Random.swift"
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      "target_dependencies" : [
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