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application crashes with textformfields; no stacktraces outputted. #62501

@mallardj

Description

@mallardj

Steps to Reproduce

  1. Run flutter create bug.
  2. Update the files as follows: Put two TextFormField Instances in the existing Column children array in MyHomePage(). (Mine have optional params, as follows:
            TextFormField(
              keyboardType: TextInputType.text,
              decoration: InputDecoration(
                labelText: "Email",
              ),
              validator: (String value) {
                return (value.isEmpty)
                    ? 'This field cannot be left blank.'
                    : ((!value.contains("@"))
                        ? 'Please fill in a valid email.'
                        : null);
              },
            ),
            TextFormField(
              keyboardType: TextInputType.text,
              obscureText: true,
              decoration: InputDecoration(
                labelText: "Password",
              ),
              validator: (String value) {
                return (value.isEmpty)
                    ? 'This field cannot be left blank.'
                    : null;
              },
            )
  1. Tap between the two repetitively, then the app crashes, the terminal outputs "Lost connection to device" without any stacktraces.

Expected results: I want to be able to switch between the fields at will.

Actual results: The app crashes while I'm tapping the different fields.

Logs
                        artialInfo.plist -additionalcontentfile
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/Runner.build
                        /Debug-iphonesimulator/Runner.build/Base.lproj/Main-SBPartialIn
                        fo.plist -additionalcontentfile
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/Runner.build
                        /Debug-iphonesimulator/Runner.build/assetcatalog_generated_info
                        .plist -o
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app/Info.plist

                    CopySwiftLibs
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app (in target 'Runner' from project 'Runner')
                        cd /Users/mxjiam/git/sandbox/bug/ios
                        export
                        CODESIGN_ALLOCATE=/Applications/Xcode.app/Contents/Developer/To
                        olchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate
                        export DEVELOPER_DIR=/Applications/Xcode.app/Contents/Developer
                        export
                        SDKROOT=/Applications/Xcode.app/Contents/Developer/Platforms/iP
                        honeSimulator.platform/Developer/SDKs/iPhoneSimulator13.6.sdk
                        builtin-swiftStdLibTool --copy --verbose --sign -
                        --scan-executable
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app/Runner --scan-folder
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app/Frameworks --scan-folder
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app/PlugIns --platform iphonesimulator --toolchain
                        /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefa
                        ult.xctoolchain --destination
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app/Frameworks --strip-bitcode --strip-bitcode-tool
                        /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefa
                        ult.xctoolchain/usr/bin/bitcode_strip --emit-dependency-info
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/Runner.build
                        /Debug-iphonesimulator/Runner.build/SwiftStdLibToolInputDepende
                        ncies.dep
                    libswiftCoreFoundation.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    libswiftFoundation.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    libswiftObjectiveC.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    libswiftCore.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    libswiftDarwin.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    libswiftDispatch.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    libswiftCoreGraphics.dylib is up to date at
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreFoundation.dylib is unchanged; keeping
                    original
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftObjectiveC.dylib is unchanged; keeping
                    original
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDarwin.dylib is unchanged; keeping
                    original
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    Codesigning
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    /usr/bin/codesign --force --sign - --verbose
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCoreGraphics.dylib is unchanged; keeping
                    original
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftDispatch.dylib is unchanged; keeping
                    original
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftFoundation.dylib is unchanged; keeping
                    original
                    Probing signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    /usr/bin/codesign -r- --display
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib
                    Code signature of
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app/Frameworks/libswiftCore.dylib is unchanged; keeping original

                    CodeSign
                    /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/Runne
                    r.app (in target 'Runner' from project 'Runner')
                        cd /Users/mxjiam/git/sandbox/bug/ios
                        export
                        CODESIGN_ALLOCATE=/Applications/Xcode.app/Contents/Developer/To
                        olchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate

                    Signing Identity:     "-"

                        /usr/bin/codesign --force --sign - --entitlements
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/Runner.build
                        /Debug-iphonesimulator/Runner.build/Runner.app.xcent
                        --timestamp=none
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app

                    ** BUILD SUCCEEDED **


                    2020-07-29 10:11:42.809 xcodebuild[95117:1514019]  DTDeviceKit:
                    deviceType from b664a810665496d49adcc42020add1aee3907546 was NULL
                    2020-07-29 10:11:42.882 xcodebuild[95117:1514094]  DTDeviceKit:
                    deviceType from b664a810665496d49adcc42020add1aee3907546 was NULL
[ +246 ms]  └─Compiling, linking and signing... (completed in 6.2s)
[        ] Xcode build done.                                           24.9s
[   +3 ms] executing: [/Users/mxjiam/git/sandbox/bug/ios/] /usr/bin/env xcrun
xcodebuild -configuration Debug VERBOSE_SCRIPT_LOGGING=YES -workspace
Runner.xcworkspace -scheme Runner BUILD_DIR=/Users/mxjiam/git/sandbox/bug/build/ios
-sdk iphonesimulator -arch x86_64
SCRIPT_OUTPUT_STREAM_FILE=/var/folders/wb/0fnjlfm973ggdqttdc3g5c240000gn/T/flutter_tool
s.X8Clky/flutter_build_log_pipe.uPBw10/pipe_to_stdout FLUTTER_SUPPRESS_ANALYTICS=true
COMPILER_INDEX_STORE_ENABLE=NO -showBuildSettings
[   +1 ms] executing: [/Users/mxjiam/git/sandbox/bug/ios/] /usr/bin/env xcrun
xcodebuild -configuration Debug VERBOSE_SCRIPT_LOGGING=YES -workspace
Runner.xcworkspace -scheme Runner BUILD_DIR=/Users/mxjiam/git/sandbox/bug/build/ios
-sdk iphonesimulator -arch x86_64
SCRIPT_OUTPUT_STREAM_FILE=/var/folders/wb/0fnjlfm973ggdqttdc3g5c240000gn/T/flutter_tool
s.X8Clky/flutter_build_log_pipe.uPBw10/pipe_to_stdout FLUTTER_SUPPRESS_ANALYTICS=true
COMPILER_INDEX_STORE_ENABLE=NO -showBuildSettings
[+4294 ms] Command line invocation:
                        /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild
                        -configuration Debug VERBOSE_SCRIPT_LOGGING=YES -workspace
                        Runner.xcworkspace -scheme Runner
                        BUILD_DIR=/Users/mxjiam/git/sandbox/bug/build/ios -sdk
                        iphonesimulator -arch x86_64
                        SCRIPT_OUTPUT_STREAM_FILE=/var/folders/wb/0fnjlfm973ggdqttdc3g5
                        c240000gn/T/flutter_tools.X8Clky/flutter_build_log_pipe.uPBw10/
                        pipe_to_stdout FLUTTER_SUPPRESS_ANALYTICS=true
                        COMPILER_INDEX_STORE_ENABLE=NO -showBuildSettings

                    Build settings from command line:
                        ARCHS = x86_64
                        BUILD_DIR = /Users/mxjiam/git/sandbox/bug/build/ios
                        COMPILER_INDEX_STORE_ENABLE = NO
                        FLUTTER_SUPPRESS_ANALYTICS = true
                        SCRIPT_OUTPUT_STREAM_FILE =
                        /var/folders/wb/0fnjlfm973ggdqttdc3g5c240000gn/T/flutter_tools.
                        X8Clky/flutter_build_log_pipe.uPBw10/pipe_to_stdout
                        SDKROOT = iphonesimulator13.6
                        VERBOSE_SCRIPT_LOGGING = YES

                    Build settings for action build and target Runner:
                        ACTION = build
                        AD_HOC_CODE_SIGNING_ALLOWED = YES
                        ALTERNATE_GROUP = staff
                        ALTERNATE_MODE = u+w,go-w,a+rX
                        ALTERNATE_OWNER = mxjiam
                        ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = NO
                        ALWAYS_SEARCH_USER_PATHS = NO
                        ALWAYS_USE_SEPARATE_HEADERMAPS = NO
                        APPLE_INTERNAL_DEVELOPER_DIR = /AppleInternal/Developer
                        APPLE_INTERNAL_DIR = /AppleInternal
                        APPLE_INTERNAL_DOCUMENTATION_DIR = /AppleInternal/Documentation
                        APPLE_INTERNAL_LIBRARY_DIR = /AppleInternal/Library
                        APPLE_INTERNAL_TOOLS = /AppleInternal/Developer/Tools
                        APPLICATION_EXTENSION_API_ONLY = NO
                        APPLY_RULES_IN_COPY_FILES = NO
                        APPLY_RULES_IN_COPY_HEADERS = NO
                        ARCHS = x86_64
                        ARCHS_STANDARD = i386 x86_64
                        ARCHS_STANDARD_32_64_BIT = i386 x86_64
                        ARCHS_STANDARD_32_BIT = i386
                        ARCHS_STANDARD_64_BIT = x86_64
                        ARCHS_STANDARD_INCLUDING_64_BIT = i386 x86_64
                        ARCHS_UNIVERSAL_IPHONE_OS = i386 x86_64
                        ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon
                        AVAILABLE_PLATFORMS = appletvos appletvsimulator iphoneos
                        iphonesimulator macosx watchos watchsimulator
                        BITCODE_GENERATION_MODE = marker
                        BUILD_ACTIVE_RESOURCES_ONLY = NO
                        BUILD_COMPONENTS = headers build
                        BUILD_DIR = /Users/mxjiam/git/sandbox/bug/build/ios
                        BUILD_LIBRARY_FOR_DISTRIBUTION = NO
                        BUILD_ROOT =
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Products
                        BUILD_STYLE = 
                        BUILD_VARIANTS = normal
                        BUILT_PRODUCTS_DIR =
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator
                        BUNDLE_CONTENTS_FOLDER_PATH_deep = Contents/
                        BUNDLE_EXECUTABLE_FOLDER_NAME_deep = MacOS
                        BUNDLE_FORMAT = shallow
                        BUNDLE_FRAMEWORKS_FOLDER_PATH = Frameworks
                        BUNDLE_PLUGINS_FOLDER_PATH = PlugIns
                        BUNDLE_PRIVATE_HEADERS_FOLDER_PATH = PrivateHeaders
                        BUNDLE_PUBLIC_HEADERS_FOLDER_PATH = Headers
                        CACHE_ROOT =
                        /var/folders/wb/0fnjlfm973ggdqttdc3g5c240000gn/C/com.apple.Deve
                        loperTools/11.6-11E708/Xcode
                        CCHROOT =
                        /var/folders/wb/0fnjlfm973ggdqttdc3g5c240000gn/C/com.apple.Deve
                        loperTools/11.6-11E708/Xcode
                        CHMOD = /bin/chmod
                        CHOWN = /usr/sbin/chown
                        CLANG_ANALYZER_NONNULL = YES
                        CLANG_CXX_LANGUAGE_STANDARD = gnu++0x
                        CLANG_CXX_LIBRARY = libc++
                        CLANG_ENABLE_MODULES = YES
                        CLANG_ENABLE_OBJC_ARC = YES
                        CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES
                        CLANG_WARN_BOOL_CONVERSION = YES
                        CLANG_WARN_COMMA = YES
                        CLANG_WARN_CONSTANT_CONVERSION = YES
                        CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES
                        CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR
                        CLANG_WARN_EMPTY_BODY = YES
                        CLANG_WARN_ENUM_CONVERSION = YES
                        CLANG_WARN_INFINITE_RECURSION = YES
                        CLANG_WARN_INT_CONVERSION = YES
                        CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES
                        CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES
                        CLANG_WARN_OBJC_LITERAL_CONVERSION = YES
                        CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR
                        CLANG_WARN_RANGE_LOOP_ANALYSIS = YES
                        CLANG_WARN_STRICT_PROTOTYPES = YES
                        CLANG_WARN_SUSPICIOUS_MOVE = YES
                        CLANG_WARN_UNREACHABLE_CODE = YES
                        CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
                        CLASS_FILE_DIR =
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/Runner.build
                        /Debug-iphonesimulator/Runner.build/JavaClasses
                        CLEAN_PRECOMPS = YES
                        CLONE_HEADERS = NO
                        CODESIGNING_FOLDER_PATH =
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator/R
                        unner.app
                        CODE_SIGNING_ALLOWED = YES
                        CODE_SIGNING_REQUIRED = YES
                        CODE_SIGN_CONTEXT_CLASS = XCiPhoneSimulatorCodeSignContext
                        CODE_SIGN_IDENTITY = -
                        CODE_SIGN_INJECT_BASE_ENTITLEMENTS = YES
                        COLOR_DIAGNOSTICS = NO
                        COMBINE_HIDPI_IMAGES = NO
                        COMPILER_INDEX_STORE_ENABLE = NO
                        COMPOSITE_SDK_DIRS =
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/CompositeSDK
                        s
                        COMPRESS_PNG_FILES = YES
                        CONFIGURATION = Debug
                        CONFIGURATION_BUILD_DIR =
                        /Users/mxjiam/git/sandbox/bug/build/ios/Debug-iphonesimulator
                        CONFIGURATION_TEMP_DIR =
                        /Users/mxjiam/Library/Developer/Xcode/DerivedData/Runner-blasvv
                        hpaevczhafriesdyrmoaak/Build/Intermediates.noindex/Runner.build
                        /Debug-iphonesimulator
                        CONTENTS_FOLDER_PATH = Runner.app
                        COPYING_PRESERVES_HFS_DATA = NO
                        COPY_HEADERS_RUN_UNIFDEF = NO
                        COPY_PHASE_STRIP = NO
                        COPY_RESOURCES_FROM_STATIC_FRAMEWORKS = YES
                        CORRESPONDING_DEVICE_PLATFORM_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.p
                        latform
                        CORRESPONDING_DEVICE_PLATFORM_NAME = iphoneos
                        CORRESPONDING_DEVICE_SDK_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.p
                        latform/Developer/SDKs/iPhoneOS13.6.sdk
                        CORRESPONDING_DEVICE_SDK_NAME = iphoneos13.6
                        CP = /bin/cp
                        CREATE_INFOPLIST_SECTION_IN_BINARY = NO
                        CURRENT_ARCH = x86_64
                        CURRENT_PROJECT_VERSION = 1
                        CURRENT_VARIANT = normal
                        DART_OBFUSCATION = false
                        DEAD_CODE_STRIPPING = YES
                        DEBUGGING_SYMBOLS = YES
                        DEBUG_INFORMATION_FORMAT = dwarf
                        DEFAULT_COMPILER = com.apple.compilers.llvm.clang.1_0
                        DEFAULT_DEXT_INSTALL_PATH = /System/Library/DriverExtensions
                        DEFAULT_KEXT_INSTALL_PATH = /System/Library/Extensions
                        DEFINES_MODULE = NO
                        DEPLOYMENT_LOCATION = NO
                        DEPLOYMENT_POSTPROCESSING = NO
                        DEPLOYMENT_TARGET_CLANG_ENV_NAME = IPHONEOS_DEPLOYMENT_TARGET
                        DEPLOYMENT_TARGET_CLANG_FLAG_NAME = mios-simulator-version-min
                        DEPLOYMENT_TARGET_CLANG_FLAG_PREFIX =
                        -mios-simulator-version-min=
                        DEPLOYMENT_TARGET_LD_ENV_NAME = IPHONEOS_DEPLOYMENT_TARGET
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                        VERSIONPLIST_PATH = Runner.app/version.plist
                        VERSION_INFO_BUILDER = mxjiam
                        VERSION_INFO_FILE = Runner_vers.c
                        VERSION_INFO_STRING = "@(#)PROGRAM:Runner  PROJECT:Runner-1"
                        WRAPPER_EXTENSION = app
                        WRAPPER_NAME = Runner.app
                        WRAPPER_SUFFIX = .app
                        WRAP_ASSET_PACKS_IN_SEPARATE_DIRECTORIES = NO
                        XCODE_APP_SUPPORT_DIR =
                        /Applications/Xcode.app/Contents/Developer/Library/Xcode
                        XCODE_PRODUCT_BUILD_VERSION = 11E708
                        XCODE_VERSION_ACTUAL = 1160
                        XCODE_VERSION_MAJOR = 1100
                        XCODE_VERSION_MINOR = 1160
                        XPCSERVICES_FOLDER_PATH = Runner.app/XPCServices
                        YACC = yacc
                        arch = x86_64
                        variant = normal


                    2020-07-29 10:12:08.295 xcodebuild[95283:1514905]  DTDeviceKit:
                    deviceType from b664a810665496d49adcc42020add1aee3907546 was NULL
                    2020-07-29 10:12:08.367 xcodebuild[95283:1514909]  DTDeviceKit:
                    deviceType from b664a810665496d49adcc42020add1aee3907546 was NULL
[ +507 ms] executing: /usr/bin/xcrun simctl install
0C90310D-243D-4DC9-B129-D7E8E1254CB0
/Users/mxjiam/git/sandbox/bug/build/ios/iphonesimulator/Runner.app
[ +785 ms] executing: /usr/bin/plutil -convert json -o -
/Users/mxjiam/git/sandbox/bug/build/ios/iphonesimulator/Runner.app/Info.plist
[  +27 ms] Exit code 0 from: /usr/bin/plutil -convert json -o -
/Users/mxjiam/git/sandbox/bug/build/ios/iphonesimulator/Runner.app/Info.plist
[        ]
{"CFBundleName":"bug","DTSDKName":"iphonesimulator13.6","DTXcode":"1160","CFBundleIcons
~ipad":{"CFBundlePrimaryIcon":{"CFBundleIconFiles":["AppIcon20x20","AppIcon29x29","AppI
con40x40","AppIcon60x60","AppIcon76x76","AppIcon83.5x83.5"],"CFBundleIconName":"AppIcon
"}},"UILaunchStoryboardName":"LaunchScreen","DTSDKBuild":"17G64","CFBundleDevelopmentRe
gion":"en","CFBundleVersion":"1","BuildMachineOSBuild":"19G73","DTPlatformName":"iphone
simulator","CFBundlePackageType":"APPL","CFBundleShortVersionString":"1.0.0","CFBundleS
upportedPlatforms":["iPhoneSimulator"],"UIMainStoryboardFile":"Main","CFBundleInfoDicti
onaryVersion":"6.0","CFBundleExecutable":"Runner","DTCompiler":"com.apple.compilers.llv
m.clang.1_0","UISupportedInterfaceOrientations~ipad":["UIInterfaceOrientationPortrait",
"UIInterfaceOrientationPortraitUpsideDown","UIInterfaceOrientationLandscapeLeft","UIInt
erfaceOrientationLandscapeRight"],"MinimumOSVersion":"8.0","CFBundleIdentifier":"com.ex
ample.bug","UIDeviceFamily":[1,2],"CFBundleSignature":"????","DTPlatformVersion":"13.6"
,"CFBundleIcons":{"CFBundlePrimaryIcon":{"CFBundleIconFiles":["AppIcon20x20","AppIcon29
x29","AppIcon40x40","AppIcon60x60"],"CFBundleIconName":"AppIcon"}},"DTXcodeBuild":"11E7
08","LSRequiresIPhoneOS":true,"UISupportedInterfaceOrientations":["UIInterfaceOrientati
onPortrait","UIInterfaceOrientationLandscapeLeft","UIInterfaceOrientationLandscapeRight
"],"UIViewControllerBasedStatusBarAppearance":false,"DTPlatformBuild":"17G64"}
[  +10 ms] executing: /usr/bin/xcrun simctl launch 0C90310D-243D-4DC9-B129-D7E8E1254CB0
com.example.bug --enable-dart-profiling --enable-checked-mode --verify-entry-points
--observatory-port=0
[ +549 ms] com.example.bug: 95314
[   +1 ms] Waiting for observatory port to be available...
[+1166 ms] Observatory URL on device: http://127.0.0.1:50295/EKFRuQJjX0Q=/
[   +6 ms] Caching compiled dill
[  +98 ms] Connecting to service protocol: http://127.0.0.1:50295/EKFRuQJjX0Q=/
[ +282 ms] Successfully connected to service protocol:
http://127.0.0.1:50295/EKFRuQJjX0Q=/
[   +3 ms] Waiting for iPhone SE (2nd generation) to report its views...
[  +14 ms] Waiting for iPhone SE (2nd generation) to report its views... (completed in
6ms)
[  +15 ms] DevFS: Creating new filesystem on the device (null)
[  +25 ms] DevFS: Created new filesystem on the device
(file:///Users/mxjiam/Library/Developer/CoreSimulator/Devices/0C90310D-243D-4DC9-B129-D
7E8E1254CB0/data/Containers/Data/Application/E4CFAB77-B4F0-46C4-8EF7-69BAC8456E47/tmp/b
ugf1nnhG/bug/)
[  +30 ms] Updating assets
[ +246 ms] Syncing files to device iPhone SE (2nd generation)...
[   +4 ms] Scanning asset files
[   +5 ms] <- reset
[        ] Compiling dart to kernel with 0 updated files
[   +2 ms] <- recompile package:bug/main.dart c2c37da8-5553-4ec5-bd51-4369cda3ec1d
[        ] <- c2c37da8-5553-4ec5-bd51-4369cda3ec1d
[ +107 ms] Updating files
[ +163 ms] DevFS: Sync finished
[   +2 ms] Syncing files to device iPhone SE (2nd generation)... (completed in 286ms)
[   +1 ms] Synced 1.6MB.
[   +4 ms] <- accept
[   +4 ms] Connected to _flutterView/0x7f8e6204fa20.
[   +2 ms] Flutter run key commands.
[   +4 ms] r Hot reload. 🔥🔥🔥
[   +2 ms] R Hot restart.
[        ] h Repeat this help message.
[   +3 ms] d Detach (terminate "flutter run" but leave application running).
[        ] c Clear the screen
[        ] q Quit (terminate the application on the device).
[        ] An Observatory debugger and profiler on iPhone SE (2nd generation) is
available at:
           http://127.0.0.1:50295/EKFRuQJjX0Q=/
[+21669 ms] Service protocol connection closed.
[   +3 ms] Lost connection to device.
[   +8 ms] DevFS: Deleting filesystem on the device
(file:///Users/mxjiam/Library/Developer/CoreSimulator/Devices/0C90310D-243D-4DC9-B129-D
7E8E1254CB0/data/Containers/Data/Application/E4CFAB77-B4F0-46C4-8EF7-69BAC8456E47/tmp/b
ugf1nnhG/bug/)
[ +261 ms] Ignored error while cleaning up DevFS: TimeoutException after
0:00:00.250000: Future not completed
[   +4 ms] "flutter run" took 68,789ms.
[ +135 ms] ensureAnalyticsSent: 123ms
[   +1 ms] Running shutdown hooks
[        ] Shutdown hook priority 4
[   +7 ms] Shutdown hooks complete
[        ] exiting with code 0
Analyzing bug...                                                        
No issues found! (ran in 15.3s;)
[✓] Flutter (Channel master, 1.21.0-6.0.pre.96, on Mac OS X 10.15.6 19G73, locale
    en-US)
    • Flutter version 1.21.0-6.0.pre.96 at /Users/mxjiam/flutter
    • Framework revision a4d570f0dd (2 hours ago), 2020-07-29 08:26:05 -0700
    • Engine revision a9910e409c
    • Dart version 2.10.0 (build 2.10.0-1.0.dev 24c7666def)

[✗] Android toolchain - develop for Android devices
    ✗ Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for
      detailed instructions).
      If the Android SDK has been installed to a custom location, set ANDROID_SDK_ROOT
      to that location.
      You may also want to add it to your PATH environment variable.


 
[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.6, Build version 11E708
    • CocoaPods version 1.8.4

[!] Android Studio (not installed)
    • Android Studio not found; download from
      https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/macos#android-setup for
      detailed instructions).

[✓] VS Code (version 1.47.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.12.2

 
[✓] Connected device (2 available)            
    • iPod touch (mobile)                 • b664a810665496d49adcc42020add1aee3907546 •
      ios • iOS 12.4.8
    • iPhone SE (2nd generation) (mobile) • 0C90310D-243D-4DC9-B129-D7E8E1254CB0     •
      ios • com.apple.CoreSimulator.SimRuntime.iOS-13-6 (simulator)

! Doctor found issues in 2 categories.

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a: text inputEntering text in a text field or keyboard related problemsc: crashStack traces logged to the consolec: fatal crashCrashes that terminate the processf: material designflutter/packages/flutter/material repository.found in release: 1.21Found to occur in 1.21frameworkflutter/packages/flutter repository. See also f: labels.has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-iosiOS applications specifically

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