[SR-11579] Compiler error when adding keypath @dynamicMemberLookup to protocol extension #53984
Description
| Previous ID | SR-11579 |
| Radar | None |
| Original Reporter | glassomoss (JIRA User) |
| Type | Bug |
| Status | Closed |
| Resolution | Done |
Additional Detail from JIRA
| Votes | 0 |
| Component/s | Compiler |
| Labels | Bug, CompilerCrash |
| Assignee | None |
| Priority | Medium |
md5: 3fc20d850ccd3dcea6565567feb66ede
Issue Description:
When I am trying to implement @dynamicMemberLookup subscript having both protocol requirement and default implementation in extension, compiler produces a segfault 11 and "Command CompileSwift failed with a nonzero exit code".
struct Context {
var points: [Int]
}
@dynamicMemberLookup
protocol Proxy: class {
var context: Context { get set }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Context, T>) -> T { get set }
}
extension Proxy {
subscript<T>(dynamicMember keyPath: WritableKeyPath<Context, T>) -> T {
get {
context[keyPath: keyPath]
}
set(newValue) {
context[keyPath: keyPath] = newValue
}
}
}However, in Xcode 11.0 GM Seed it was at least working correctly in playground. In Xcode 11.1 GM Seed (11A1027) it's not working in pg either: just running endlessly. The only way to make it work is to remove default implementation from extension, which in fact is rightly the opposite situation to SR-8077