[SR-4477] Protocol composition results in EXC_BAD_ACCESS #47054
Description
| Previous ID | SR-4477 |
| Radar | rdar://problem/31404278 |
| Original Reporter | salutis (JIRA User) |
| Type | Bug |
| Status | Resolved |
| Resolution | Done |
Additional Detail from JIRA
| Votes | 0 |
| Component/s | Standard Library |
| Labels | Bug, Runtime |
| Assignee | salutis (JIRA) |
| Priority | Medium |
md5: c528652076c750121e14e91c0b0093b8
is duplicated by:
- SR-5043 App crashes when calling method on downcasted object
Issue Description:
An EXC_BAD_ACCESS here:
protocol Something {}
protocol IntContainer {
var ints: [Int] { get set }
}
func processSomething(_ state: Something) {
if let intContainer = state as? Something & IntContainer {
print(intContainer.ints)
}
}
struct MySomething: Something, IntContainer {
var ints: [Int] = []
}
let mySomething = MySomething()
processSomething(mySomething) // EXC_BAD_ACCESS hereThe execution stops here:
libswiftCore.dylib`_swift_release_dealloc:
0x11be163e0 <+0>: movq (%rdi), %rax
-> 0x11be163e3 <+3>: jmpq *-0x10(%rax)
0x11be163e6 <+6>: nopw %cs:(%rax,%rax)Related StackOverflow question with no good answer:
http://stackoverflow.com/questions/35199077/exc-bad-access-using-protocol-composition