NSRangeException in closure_parameter_position rule

[alejandro-isaza]

swiftlint version: 0.14.0

*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff822f9e7b __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x00007fff96ee4cad objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff8237899d +[NSException raise:format:] + 205
	3   Foundation                          0x00007fff83c893f8 -[NSRegularExpression(NSMatching) enumerateMatchesInString:options:range:usingBlock:] + 375
	4   Foundation                          0x00007fff83c8926f -[NSRegularExpression(NSMatching) matchesInString:options:range:] + 152
	5   SwiftLintFramework                  0x000000010f1243b8 _TTSf4g_n_g_g_n___TFFV18SwiftLintFramework28ClosureParameterPositionRule12validateFileFTC21SourceKittenFramework4File4kindOS_19SwiftExpressionKind10dictionaryGVs10DictionarySSPS1_22SourceKitRepresentable___GSaVS_14StyleViolation_U2_FGS4_SSPS5___GSqS6__ + 1096
	6   SwiftLintFramework                  0x000000010f12537a _TTSf4g_n_g_n___TFV18SwiftLintFramework28ClosureParameterPositionRule12validateFilefTC21SourceKittenFramework4File4kindOS_19SwiftExpressionKind10dictionaryGVs10DictionarySSPS1_22SourceKitRepresentable___GSaVS_14StyleViolation_ + 2810
	7   SwiftLintFramework                  0x000000010f1f2c62 _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1282
	8   SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	9   SwiftLintFramework                  0x000000010f1f2bcb _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1131
	10  SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	11  SwiftLintFramework                  0x000000010f1f2bcb _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1131
	12  SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	13  SwiftLintFramework                  0x000000010f1f2bcb _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1131
	14  SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	15  SwiftLintFramework                  0x000000010f1f2bcb _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1131
	16  SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	17  SwiftLintFramework                  0x000000010f1f2bcb _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1131
	18  SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	19  SwiftLintFramework                  0x000000010f1f2bcb _TTSf4n_n_g___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFileFTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation_U_FPS6__GSaS7___merged + 1131
	20  SwiftLintFramework                  0x000000010f1f3207 _TTSf4g_g_n___TTSg5V18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS0_S_7ASTRuleS____TFe18SwiftLintFrameworkRxS_7ASTRuleWx8KindType8RawValue_zSSrS0_12validateFilefTC21SourceKittenFramework4File10dictionaryGVs10DictionarySSPS3_22SourceKitRepresentable___GSaVS_14StyleViolation__merged + 1095
	21  SwiftLintFramework                  0x000000010f0be6cc _TTWV18SwiftLintFramework39EmptyParenthesesWithTrailingClosureRuleS_4RuleS_FS1_12validateFilefC21SourceKittenFramework4FileGSaVS_14StyleViolation__merged + 44
	22  SwiftLintFramework                  0x000000010f0f7cd6 _TTSf4n_s_n_n_n___TFFV18SwiftLintFramework6LinterP33_5A5F37FCDEE0B4D78BAE05A90BA8A06218getStyleViolationsFSbTGSaVS_14StyleViolation_GSaT2idSS4timeSd___U_FPS_4Rule_GSaS1__ + 614
	23  SwiftLintFramework                  0x000000010f0f895a _TTSf4n_s___TFV18SwiftLintFramework6LinterP33_5A5F37FCDEE0B4D78BAE05A90BA8A06218getStyleViolationsfSbTGSaVS_14StyleViolation_GSaT2idSS4timeSd___ + 794
	24  SwiftLintFramework                  0x000000010f0f4b89 _TFV18SwiftLintFramework6Linterg15styleViolationsGSaVS_14StyleViolation_ + 25
	25  swiftlint                           0x000000010f01a25d swiftlint + 78429
	26  swiftlint                           0x000000010f01e6b1 swiftlint + 95921
	27  swiftlint                           0x000000010f01e738 swiftlint + 96056
	28  libswiftObjectiveC.dylib            0x000000010fbcf4d6 _TF10ObjectiveC15autoreleasepoolurFzT8invokingFzT_x_x + 54
	29  swiftlint                           0x000000010f019a1f swiftlint + 76319
	30  swiftlint                           0x000000010f01e1b1 swiftlint + 94641
	31  swiftlint                           0x000000010f011368 swiftlint + 41832
	32  swiftlint                           0x000000010f00e813 swiftlint + 30739
	33  swiftlint                           0x000000010f010c34 swiftlint + 39988
	34  swiftlint                           0x000000010f0108cf swiftlint + 39119
	35  swiftlint                           0x000000010f011d3e swiftlint + 44350
	36  Result                              0x000000010f08d2ad _TFO6Result6Result8analysisurfT9ifSuccessFxqd__9ifFailureFq_qd___qd__ + 365
	37  Result                              0x000000010f087727 _TTWu0_R_s5ErrorrGO6Result6Resultxq__S0_14ResultProtocolS0_FS2_8analysisurfT9ifSuccessFwx5Valueqd__9ifFailureFwx5Errorqd___qd__ + 231
	38  Result                              0x000000010f085c8a _TFE6ResultPS_14ResultProtocol7flatMapurfFwx5ValueGOS_6Resultqd__wx5Error_GS2_qd__wxS3__ + 186
	39  swiftlint                           0x000000010f010712 swiftlint + 38674
	40  swiftlint                           0x000000010f01934e swiftlint + 74574
	41  swiftlint                           0x000000010f00cbcc swiftlint + 23500
	42  Commandant                          0x000000010f04ff98 _TFFV10Commandant14CommandWrappercuRd__S_15CommandProtocolxzWd__7Options11ClientError_wd__11ClientErrorzWd__S2_S3__rFqd__GS0_x_U_FCS_14ArgumentParserGO6Result6ResultT_GOS_15CommandantErrorQ___ + 1176
	43  Commandant                          0x000000010f054b28 _TPA__TFFV10Commandant14CommandWrappercuRd__S_15CommandProtocolxzWd__7Options11ClientError_wd__11ClientErrorzWd__S2_S3__rFqd__GS0_x_U_FCS_14ArgumentParserGO6Result6ResultT_GOS_15CommandantErrorQ___ + 88
	44  Commandant                          0x000000010f050b84 _TFC10Commandant15CommandRegistry3runfT7commandSS9argumentsGSaSS__GSqGO6Result6ResultT_GOS_15CommandantErrorx___ + 292
	45  Commandant                          0x000000010f0510e9 _TFC10Commandant15CommandRegistry4mainfT9argumentsGSaSS_11defaultVerbSS12errorHandlerFxT__Os5Never + 505
	46  Commandant                          0x000000010f050ee7 _TFC10Commandant15CommandRegistry4mainfT11defaultVerbSS12errorHandlerFxT__Os5Never + 135
	47  swiftlint                           0x000000010f00c8e0 swiftlint + 22752
	48  libdispatch.dylib                   0x00007fff9779aef7 _dispatch_call_block_and_release + 12
	49  libdispatch.dylib                   0x00007fff977920b8 _dispatch_client_callout + 8
	50  libdispatch.dylib                   0x00007fff977a1266 _dispatch_queue_override_invoke + 743
	51  libdispatch.dylib                   0x00007fff97793e70 _dispatch_root_queue_drain + 476
	52  libdispatch.dylib                   0x00007fff97793c47 _dispatch_worker_thread3 + 99
	53  libsystem_pthread.dylib             0x00007fff979df712 _pthread_wqthread + 1299
	54  libsystem_pthread.dylib             0x00007fff979df1ed start_wqthread + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
[1]```

[marcelofabri]

Can you add the file that is causing this crash or any other useful info?

[alejandro-isaza]

Sorry, no. If I knew the line number I could share that.

[marcelofabri]

If you could try to reduce the crash to a sample (sharable) example, it'd be really helpful.

[alejandro-isaza]

Ok, I narrowed it down to this:

let mediaView: UIView = { [weak self] index in
    return UIView()
}(index)

[marcelofabri]

I was able to reproduce it, thanks so much for narrowing it down!

[marcelofabri]

I've opened #1027 which seems to fix the issue. Could you please test it against your codebase? ✅

[alejandro-isaza]

It works! Thanks for the quick fix. 💯