[dart2wasm] co19/LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A08_t02 crashes compiler

[sgrekhov]

The following test crashes dart2wasm compiler

/==========================================================================================================================\
| co19/LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A08_t02 is new and failed (Crash, expected Pass) |
\==========================================================================================================================/

--- Command "dart2wasm" (took 01.000431s):
DART_CONFIGURATION=ReleaseX64 CHROME_PATH=/b/s/w/ir/cache/builder/sdk/third_party/browsers/chrome/chrome/google-chrome sdk/bin/dart2wasm_developer -Dtest_runner.configuration=dart2wasm-linux-chrome --enable-experiment=inline-class /b/s/w/ir/cache/builder/sdk/tests/co19/src/LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A08_t02.dart /b/s/w/ir/cache/builder/sdk/out/ReleaseX64/generated_tests/dart2wasm-linux-chrome/tests_co19_src_LanguageFeatures_Extension-types_superinterfaces_of_extension_type_A08_t02/superinterfaces_of_extension_type_A08_t02.wasm

exit code:
255

stdout:
Exception in ConstantExpression at file:///b/s/w/ir/cache/builder/sdk/tests/co19/src/LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A08_t02.dart:38:9

stderr:
Unhandled exception:
Null check operator used on a null value
#0      ConstantCreator._makeInterfaceType.<anonymous closure> (package:dart2wasm/constants.dart:731)
#1      ConstantCreator.createConstant (package:dart2wasm/constants.dart:282)
#2      ConstantCreator._makeInterfaceType (package:dart2wasm/constants.dart:730)
#3      ConstantCreator.visitTypeLiteralConstant (package:dart2wasm/constants.dart:807)
#4      TypeLiteralConstant.accept (package:kernel/ast.dart:14286)
#5      ConstantCreator.ensureConstant (package:dart2wasm/constants.dart:249)
#6      ConstantCreator.visitTypeLiteralConstant (package:dart2wasm/constants.dart:813)
#7      TypeLiteralConstant.accept (package:kernel/ast.dart:14286)
#8      ConstantCreator.ensureConstant (package:dart2wasm/constants.dart:249)
#9      ConstantInstantiator.defaultConstant (package:dart2wasm/constants.dart:142)
#10     ConstantVisitorDefaultMixin.visitTypeLiteralConstant (package:kernel/visitor.dart:953)
#11     TypeLiteralConstant.accept (package:kernel/ast.dart:14286)
#12     ConstantInstantiator.instantiate (package:dart2wasm/constants.dart:126)
#13     Constants.instantiateConstant (package:dart2wasm/constants.dart:108)
#14     CodeGenerator.visitConstantExpression (package:dart2wasm/code_generator.dart:2866)
#15     ConstantExpression.accept1 (package:kernel/ast.dart:8621)
#16     CodeGenerator.wrap (package:dart2wasm/code_generator.dart:882)
#17     CodeGenerator.visitArgumentsLists (package:dart2wasm/code_generator.dart:2774)
#18     CodeGenerator._visitArguments (package:dart2wasm/code_generator.dart:2808)
#19     CodeGenerator.visitStaticInvocation (package:dart2wasm/code_generator.dart:1759)
#20     StaticInvocation.accept1 (package:kernel/ast.dart:6543)
#21     CodeGenerator.wrap (package:dart2wasm/code_generator.dart:882)
#22     CodeGenerator.visitExpressionStatement (package:dart2wasm/code_generator.dart:1358)
#23     ExpressionStatement.accept (package:kernel/ast.dart:9105)
#24     CodeGenerator.visitStatement (package:dart2wasm/code_generator.dart:893)
#25     CodeGenerator.visitBlock (package:dart2wasm/code_generator.dart:1015)
#26     Block.accept (package:kernel/ast.dart:9155)
#27     CodeGenerator.visitStatement (package:dart2wasm/code_generator.dart:893)
#28     CodeGenerator.generateBody (package:dart2wasm/code_generator.dart:578)
#29     CodeGenerator.generate (package:dart2wasm/code_generator.dart:234)
#30     Translator.translate (package:dart2wasm/translator.dart:344)
#31     compileToModule (package:dart2wasm/compile.dart:153)
<asynchronous suspension>
#32     main (package:dart2wasm/dart2wasm.dart:143)
<asynchronous suspension>
#33     main (file:///b/s/w/ir/cache/builder/sdk/pkg/dart2wasm/bin/dart2wasm.dart:7)
<asynchronous suspension>

--- Re-run this test:
python3 tools/test.py -n dart2wasm-linux-chrome co19/LanguageFeatures/Extension-types/superinterfaces_of_extension_type_A08_t02

[askeksa]

The program contains an ExtensionType (ET4 in this case) whose extensionTypeErasure points to an InterfaceType (for the class A in this case) that is not listed in the component. @johnniwinther @alexmarkov CFE or TFA bug?