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swift::Expr::propagateLValueAccessKind(…)","user":{"login":"practicalswift","id":7826565,"avatar_url":"https://avatars.githubusercontent.com/u/7826565?v=3","gravatar_id":"","url":"https://api.github.com/users/practicalswift","html_url":"https://github.com/practicalswift","followers_url":"https://api.github.com/users/practicalswift/followers","following_url":"https://api.github.com/users/practicalswift/following{/other_user}","gists_url":"https://api.github.com/users/practicalswift/gists{/gist_id}","starred_url":"https://api.github.com/users/practicalswift/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/practicalswift/subscriptions","organizations_url":"https://api.github.com/users/practicalswift/orgs","repos_url":"https://api.github.com/users/practicalswift/repos","events_url":"https://api.github.com/users/practicalswift/events{/privacy}","received_events_url":"https://api.github.com/users/practicalswift/received_events","type":"User","site_admin":false},"body":"Stack trace:\r\n\r\n```\r\n<stdin>:3:1: error: expressions are not allowed at the top level\r\n.x.a=Int\r\n^\r\nnot an l-value\r\nUNREACHABLE executed at /path/to/swift/include/swift/AST/ExprNodes.def:79!\r\n6  sil-opt         0x000000000309743d llvm::llvm_unreachable_internal(char const*, char const*, unsigned int) + 461\r\n8  sil-opt         0x0000000000e39837 swift::Expr::propagateLValueAccessKind(swift::AccessKind, bool) + 23\r\n12 sil-opt         0x0000000000dc250c swift::Expr::walk(swift::ASTWalker&) + 108\r\n13 sil-opt         0x0000000000b93df2 swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 514\r\n14 sil-opt         0x0000000000ae2e86 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::TypeLoc, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem*) + 1126\r\n17 sil-opt         0x0000000000bb2a17 swift::constraints::ConstraintSystem::diagnoseFailureForExpr(swift::Expr*) + 7671\r\n18 sil-opt         0x0000000000bb750e swift::constraints::ConstraintSystem::salvage(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::Expr*) + 4078\r\n19 sil-opt         0x0000000000adf6f7 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>) + 471\r\n20 sil-opt         0x0000000000ae2dd5 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::TypeLoc, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem*) + 949\r\n22 sil-opt         0x0000000000b66cd6 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134\r\n23 sil-opt         0x0000000000b1f3cd swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int, unsigned int) + 1133\r\n24 sil-opt         0x00000000007758a9 swift::CompilerInstance::performSema() + 3289\r\n25 sil-opt         0x000000000075ec65 main + 1813\r\nStack dump:\r\n0.\tProgram arguments: sil-opt -enable-sil-verify-all\r\n1.\tWhile type-checking expression at [<stdin>:3:1 - line:3:6] RangeText=\".x.a=I\"\r\n2.\tWhile type-checking expression at [<stdin>:3:1 - line:3:6] RangeText=\".x.a=I\"\r\n```","created_at":"2016-09-11T09:23:58Z","updated_at":"2016-09-11T09:23:58Z","closed_at":null,"merged_at":null,"merge_commit_sha":null,"assignee":null,"assignees":[],"milestone":null,"commits_url":"https://api.github.com/repos/apple/swift/pulls/4710/commits","review_comments_url":"https://api.github.com/repos/apple/swift/pulls/4710/comments","review_comment_url":"https://api.github.com/repos/apple/swift/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apple/swift/issues/4710/comments","statuses_url":"https://api.github.com/repos/apple/swift/statuses/a807e6de563cddbab0f1d117789ff19860738862","head":{"label":"practicalswift:sil-034-swift-expr-propagatelvalueaccesskind","ref":"sil-034-swift-expr-propagatelvalueaccesskind","sha":"a807e6de563cddbab0f1d117789ff19860738862","user":{"login":"practicalswift","id":7826565,"avatar_url":"https://avatars.githubusercontent.com/u/7826565?v=3","gravatar_id":"","url":"https://api.github.com/users/practicalswift","html_url":"https://github.com/practicalswift","followers_url":"https://api.github.com/users/practicalswift/followers","following_url":"https://api.github.com/users/practicalswift/following{/other_user}","gists_url":"https://api.github.com/users/practicalswift/gists{/gist_id}","starred_url":"https://api.github.com/users/practicalswift/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/practicalswift/subscriptions","organizations_url":"https://api.github.com/users/practicalswift/orgs","repos_url":"https://api.github.com/users/practicalswift/repos","events_url":"https://api.github.com/users/practicalswift/events{/privacy}","received_events_url":"https://api.github.com/users/practicalswift/received_events","type":"User","site_admin":false},"repo":{"id":47491399,"name":"swift","full_name":"practicalswift/swift","owner":{"login":"practicalswift","id":7826565,"avatar_url":"https://avatars.githubusercontent.com/u/7826565?v=3","gravatar_id":"","url":"https://api.github.com/users/practicalswift","html_url":"https://github.com/practicalswift","followers_url":"https://api.github.com/users/practicalswift/followers","following_url":"https://api.github.com/users/practicalswift/following{/other_user}","gists_url":"https://api.github.com/users/practicalswift/gists{/gist_id}","starred_url":"https://api.github.com/users/practicalswift/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/practicalswift/subscriptions","organizations_url":"https://api.github.com/users/practicalswift/orgs","repos_url":"https://api.github.com/users/practicalswift/repos","events_url":"https://api.github.com/users/practicalswift/events{/privacy}","received_events_url":"https://api.github.com/users/practicalswift/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/practicalswift/swift","description":"The 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