[SR-11080] assertion failed: "concrete buffer already formed?!"

[swift-ci]

Previous ID	SR-11080
Radar	None
Original Reporter	wimlewis (JIRA User)
Type	Bug

Attachment: Download

Environment

Ubuntu Linux, x86_64

swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04

Additional Detail from JIRA

Votes	0
Component/s	Compiler
Labels	Bug, CompilerCrash
Assignee	None
Priority	Medium

md5: dcc28e5b873fd3af8ffc5581f00b33a7

Issue Description:

The attached project crashes swift build with the following messages. (The code looks weird because I ran it through a delta minimizer.)

swift: /home/buildnode/jenkins/workspace/oss-swift-5.1-package-linux-ubuntu-18_04/swift/lib/SILGen/SILGenConvert.cpp:556: virtual swift::SILValue (anonymous namespace)::ExistentialInitialization::getAddressForInPlaceInitialization(swift::Lowering::SILGenFunction &, swift::SILLocation): Assertion !concreteBuffer && "concrete buffer already formed?!"' failed. Stack dump: 0. Program arguments: /home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift -frontend -c /home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift -primary-file /home/wiml/src/swiftder/minimize/CompilerCrashExample/src/main.swift -emit-module-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/mainpartial.swiftmodule -emit-module-doc-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/mainpartial.swiftdoc -emit-dependencies-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/main.d -emit-reference-dependencies-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/main.swiftdeps -target x86_64-unknown-linux -disable-objc-interop -sdk / -I /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug -enable-testing -g -module-cache-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/ModuleCache -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -color-diagnostics -enable-anonymous-context-mangled-names -module-name CompilerCrashExample -o /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/main.swift.o -index-store-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/index/store -index-system-modules #​0 0x00000000044cd6a4 PrintStackTraceSignalHandler(void*) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x44cd6a4) #​1 0x00000000044cb2fe llvm::sys::RunSignalHandlers() (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x44cb2fe) #​2 0x00000000044cdab8 SignalHandler(int) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x44cdab8) #​3 0x00007fabea15ddd0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12dd0) #​4 0x00007fabe95cc077 gsignal /build/glibc-B9XfQf/glibc-2.28/signal/../sysdeps/unix/sysv/linux/internal-signals.h:84:10 #​5 0x00007fabe95ad535 abort /build/glibc-B9XfQf/glibc-2.28/stdlib/abort.c:81:7 #​6 0x00007fabe95ad40f get_sysdep_segment_value /build/glibc-B9XfQf/glibc-2.28/intl/loadmsgcat.c:509:8 #​7 0x00007fabe95ad40f __tls_get_addr /build/glibc-B9XfQf/glibc-2.28/intl/loadmsgcat.c:970:34 #​8 0x00007fabe95bd142 (/lib/x86_64-linux-gnu/libc.so.6+0x32142) #​9 0x000000000085e232 (anonymous namespace)::ExistentialInitialization::getAddressForInPlaceInitialization(swift::Lowering::SILGenFunction&, swift::SILLocation) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x85e232) #10 0x0000000000888aa6 (anonymous namespace)::RValueEmitter::visitOptionalTryExpr(swift::OptionalTryExpr*, swift::Lowering::SGFContext) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x888aa6) #11 0x000000000087f9ee swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::visit(swift::Expr*, swift::Lowering::SGFContext) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x87f9ee)`

[belkadan]

The code doesn't compile, at least not on a Mac. What's "id" supposed to be?