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Stack trace:
```
swift: /path/to/swift/lib/AST/ArchetypeBuilder.cpp:2051: auto swift::ArchetypeBuilder::mapTypeIntoContext(Module *, swift::GenericParamList *, swift::Type, swift::LazyResolver *)::(anonymous class)::operator()(swift::Type) const: Assertion `genericParamsDepth >= depth' failed.
9 swift 0x00000000010d7dc4 swift::Type::transform(llvm::function_ref<swift::Type (swift::Type)>) const + 36
10 swift 0x00000000010d8060 swift::Type::transform(llvm::function_ref<swift::Type (swift::Type)>) const + 704
11 swift 0x00000000010d866c swift::Type::transform(llvm::function_ref<swift::Type (swift::Type)>) const + 2252
12 swift 0x0000000000fa689b swift::ArchetypeBuilder::mapTypeIntoContext(swift::DeclContext*, swift::Type, swift::LazyResolver*) + 171
13 swift 0x00000000010d4dd4 swift::TypeBase::getSuperclass(swift::LazyResolver*) + 244
14 swift 0x0000000000e7e25d swift::TypeChecker::defineDefaultConstructor(swift::NominalTypeDecl*) + 109
15 swift 0x0000000000e7d3a3 swift::TypeChecker::addImplicitConstructors(swift::NominalTypeDecl*) + 1411
20 swift 0x0000000000e77716 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 150
23 swift 0x0000000000ed91fa swift::TypeChecker::typeCheckClosureBody(swift::ClosureExpr*) + 218
24 swift 0x0000000000f031ac swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 876
25 swift 0x0000000000e657e1 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::TypeLoc, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 769
27 swift 0x0000000000ed9346 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134
28 swift 0x0000000000e991bd swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int) + 1117
29 swift 0x0000000000c36eef swift::CompilerInstance::performSema() + 3295
31 swift 0x00000000007c5006 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2838
32 swift 0x0000000000791b08 main + 2840
Stack dump:
0. Program arguments: /path/to/swift/bin/swift -frontend -c -primary-file validation-test/compiler_crashers/28289-swift-type-transform.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -module-name main -o /tmp/28289-swift-type-transform-3028ba.o
1. While type-checking expression at [validation-test/compiler_crashers/28289-swift-type-transform.swift:10:1 - line:11:9] RangeText="{class B<t{typealias d<a>:S<a>class a:d
2. While type-checking 'B' at validation-test/compiler_crashers/28289-swift-type-transform.swift:10:2
3. While defining default constructor for 'a' at validation-test/compiler_crashers/28289-swift-type-transform.swift:10:31
<unknown>:0: error: unable to execute command: Aborted
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)
```
// This source file is part of the Swift.org open source project // Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors // Licensed under Apache License v2.0 with Runtime Library Exception // // See http://swift.org/LICENSE.txt for license information // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors Repository: https://github.com/practicalswift/swift-compiler-crashes.git Web URL: https://github.com/practicalswift/swift-compiler-crashes