import Foundation

class WithObjcFunc {
  @objc
  func withObjc() {}
}

extension WithObjcFunc {
    @objc
    func funcInExtension() {}
}

swift: /home/buildnode/jenkins/workspace/oss-swift-4.2-package-linux-ubuntu-18_04/swift/lib/IRGen/GenClass.cpp:2201: llvm::Constant *swift::irgen::emitCategoryData(swift::irgen::IRGenModule &, swift::ExtensionDecl *): Assertion `IGM.ObjCInterop && "emitting RO-data outside of interop mode"' failed.
/usr/local/bin/swift[0x3defe74]
/usr/local/bin/swift[0x3dedc8c]
/usr/local/bin/swift[0x3df0032]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12890)[0x7f69dd8ee890]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f69dbd51e97]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7f69dbd53801]
/lib/x86_64-linux-gnu/libc.so.6(+0x3039a)[0x7f69dbd4339a]
/lib/x86_64-linux-gnu/libc.so.6(+0x30412)[0x7f69dbd43412]
/usr/local/bin/swift[0x64f0af]
/usr/local/bin/swift[0x4dd661]
/usr/local/bin/swift[0x4d4db5]
/usr/local/bin/swift[0x58f54c]
/usr/local/bin/swift[0x58fc53]
/usr/local/bin/swift[0x4b4218]
/usr/local/bin/swift[0x4afdc0]
/usr/local/bin/swift[0x46ae38]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7)[0x7f69dbd34b97]
/usr/local/bin/swift[0x46904a]
Stack dump:
0.      Program arguments: /usr/local/bin/swift -frontend -c -primary-file foo.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -color-diagnostics -module-name foo -o /tmp/foo-3c700d.o
1.      While emitting IR for source file foo.swift
<unknown>:0: error: unable to execute command: Aborted
<unknown>:0: error: compile command failed due to signal 6 (use -v to see invocation)