[swiftc] Add test case for crash triggered in swift::Expr::walk(…) #1692
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…::ASTWalker&) Stack trace: ``` swift: /path/to/llvm/include/llvm/ADT/Optional.h:138: T &&llvm::Optional<swift::constraints::SelectedOverload>::operator*() && [T = swift::constraints::SelectedOverload]: Assertion `hasVal' failed. 11 swift 0x0000000000fdfea5 swift::Expr::walk(swift::ASTWalker&) + 69 12 swift 0x0000000000ed3e26 swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 502 13 swift 0x0000000000e36d5a swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 746 16 swift 0x0000000000ef093b swift::constraints::ConstraintSystem::diagnoseFailureForExpr(swift::Expr*) + 10971 17 swift 0x0000000000ef29a0 swift::constraints::ConstraintSystem::salvage(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::Expr*) + 4064 18 swift 0x0000000000e30803 swift::TypeChecker::solveForExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::FreeTypeVariableBinding, swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem&, llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>) + 787 19 swift 0x0000000000e36cb0 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 576 21 swift 0x0000000000ea8986 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134 22 swift 0x0000000000e6c27d swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int) + 1149 23 swift 0x0000000000cbdccf swift::CompilerInstance::performSema() + 3087 25 swift 0x000000000078b89f frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2495 26 swift 0x0000000000786365 main + 2837 Stack dump: 0. Program arguments: /path/to/swift/bin/swift -frontend -c -primary-file validation-test/compiler_crashers/28272-swift-expr-walk.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -module-name main -o /tmp/28272-swift-expr-walk-29a7d7.o 1. While type-checking expression at [validation-test/compiler_crashers/28272-swift-expr-walk.swift:6:1 - line:6:3] RangeText=".A[" 2. While type-checking expression at [validation-test/compiler_crashers/28272-swift-expr-walk.swift:6:1 - line:6:3] RangeText=".A[" <unknown>:0: error: unable to execute command: Aborted <unknown>:0: error: compile command failed due to signal (use -v to see invocation) ```
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…walk [swiftc] Add test case for crash triggered in swift::Expr::walk(…)
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What's in this pull request?
Crash case with stack trace:
Resolved bug number: (SR-)
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