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Stack trace:
```
swift: /path/to/llvm/include/llvm/ADT/TinyPtrVector.h:182: EltTy llvm::TinyPtrVector<swift::ArchetypeBuilder::PotentialArchetype *>::front() const [EltTy = swift::ArchetypeBuilder::PotentialArchetype *]: Assertion `!empty() && "vector empty"' failed.
10 swift 0x0000000000f78281 swift::ArchetypeBuilder::getGenericSignature(llvm::ArrayRef<swift::GenericTypeParamType*>) + 1089
11 swift 0x0000000000e885f7 swift::TypeChecker::validateGenericFuncSignature(swift::AbstractFunctionDecl*) + 359
16 swift 0x0000000000e52296 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 150
19 swift 0x0000000000eb203a swift::TypeChecker::typeCheckClosureBody(swift::ClosureExpr*) + 218
20 swift 0x0000000000edc00c swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 812
21 swift 0x0000000000e401aa swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 746
23 swift 0x0000000000eb2186 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134
24 swift 0x0000000000e755bd swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int) + 1117
25 swift 0x0000000000cc6e2f swift::CompilerInstance::performSema() + 3087
27 swift 0x000000000078d17c frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2492
28 swift 0x0000000000787c45 main + 2837
Stack dump:
0. Program arguments: /path/to/swift/bin/swift -frontend -c -primary-file validation-test/compiler_crashers/28277-swift-archetypebuilder-getgenericsignature.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -module-name main -o /tmp/28277-swift-archetypebuilder-getgenericsignature-82990f.o
1. While type-checking expression at [validation-test/compiler_crashers/28277-swift-archetypebuilder-getgenericsignature.swift:10:1 - line:13:23] RangeText="{
2. While type-checking 'A' at validation-test/compiler_crashers/28277-swift-archetypebuilder-getgenericsignature.swift:11:1
<unknown>:0: error: unable to execute command: Aborted
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)
```
These test cases under MIT License: The MIT License (MIT) Copyright (c) 2014-2016 practicalswift Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Repository: https://github.com/practicalswift/swift-compiler-crashes.git Web URL: https://github.com/practicalswift/swift-compiler-crashes Tests updated as of revision a98b6a75b8622dfc44dd56ddea633a9254ac7f1a