Iceman

@swift-main -swift-version 6

import Synchronization final class Foo { var value = 0 } nonisolated func main() { let mutex = Mutex(Foo()) let foo = mutex.withLock { $0 } Task.detached { let foo = mutex.withLock { $0 } foo.value += 1 } foo.value += 1 print(foo.value) } main()

exit status 255 with stderr:

JIT session error: Symbols not found: [ __tlsdesc_resolver, __aarch64_cas4_acq, __aarch64_cas4_rel ] Failed to materialize symbols: { (main, { $s15Synchronization5MutexVAARi_zrlE8withLockyqd__qd__xzYuqd_0_YKYTXEqd_0_YKs5ErrorRd_0_Ri_d__r0_lF6$deferL_yysAERd_0_Ri_zRi_d__r_0_lF, $sScPSgWOc, $s4main3FooC5valueSivs, got.$s15Synchronization5MutexVMn, symbolic _____y_____G_Xx 15Synchronization5MutexVAARi_zrlE 4main3FooC, $s15Synchronization6AtomicVys6UInt32VGMD, $s4main3FooCMn, $sSpsRi_zrlE10initialize2toyxn_tF, symbolic xIeAgHr_, $s4main3FooCN, $s4main3FooCfD, $ss5print_9separator10terminatoryypd_S2StFfA0_, $sScTss5NeverORs_rlE8detached4name8priority9operationScTyxABGSSSg_ScPSgxyYaYAcntFZBoSRys4Int8VGXEfU_, symbolic ScPSg, $s4main3FooCACycfc, $sScPSgMD, $s4mainMXM, got.$ss6UInt32VMn, symbolic _____y_____G 15Synchronization6AtomicV s6UInt32V, $sxIeAgHr_xs5Error_pIegHrzo_s8SendableRzs5NeverORs_r0_lTRTu, $s4main3FooCACycfC, __swift_instantiateConcreteTypeFromMangledName, $s4main3FooC5valueSivpWvd, symbolic x, symbolic ScA_pSg, got.$s15Synchronization6AtomicVMn, $s15Synchronization5_CellVy4main3FooCGMD, main, got.$s15Synchronization5_CellVMn, $ss5print_9separator10terminatoryypd_S2StFfA1_, symbolic _____y_____G 15Synchronization5MutexVAARi_zrlE 4main3FooC, $sSa12_endMutationyyF, $s4main3FooC5valueSivg, symbolic B0, $ss27_finalizeUninitializedArrayySayxGABnlF, $sScPSgWOh, $s4main3FooCfd, symbolic _____ 4main3FooC, $s4main3FooCMa, symbolic _____y_____G 15Synchronization5_CellVAARi_zrlE 4main3FooC, $sScTyScTyxq_GBocfC, $s4main3FooCACycfCTq, $sScTss5NeverORs_rlE8detached4name8priority9operationScTyxABGSSSg_ScPSgxyYaYAcntFZ, symbolic Si, $s4mainAAyyF, $sxIeAgHr_xs5Error_pIegHrzo_s8SendableRzs5NeverORs_r0_lTR }) }