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Crash: Unexpectedly found nil while unwrapping an Optional value #790

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115 changes: 115 additions & 0 deletions Tests/OpenSwiftUICoreTests/View/VariadicViewTests.swift
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Original file line number Diff line number Diff line change
@@ -0,0 +1,115 @@
//
// VariadicViewTests.swift
// OpenSwiftUICoreTests

import Foundation
import OpenSwiftUICore
import Testing

struct PassthroughUnaryViewRoot: _VariadicView.UnaryViewRoot {
func body(children: _VariadicView.Children) -> some View {
children
}
}

struct PassthroughMultiViewRoot: _VariadicView.MultiViewRoot {
func body(children: _VariadicView.Children) -> some View {
children
}
}

@MainActor
struct VariadicViewTests {

#if canImport(Darwin)
@Test
func nestedUnaryViewRoot() {
struct ContentView: View {
var body: some View {
_VariadicView.Tree(PassthroughUnaryViewRoot()) {
_VariadicView.Tree(PassthroughUnaryViewRoot()) {
Color.red
Color.blue
}
}
}
}

let graph = ViewGraph(
rootViewType: ContentView.self,
requestedOutputs: [.displayList]
)
graph.instantiateOutputs()
graph.setRootView(ContentView())
graph.setProposedSize(CGSize(width: 100, height: 100))
let (displayList, _) = graph.displayList()
let expectRegex = try! Regex(
#"""
\(display-list
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(effect
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(effect
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(content-seed \d+\)
\(color #[0-9A-F]{8}\)\)\)\)
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(effect
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(content-seed \d+\)
\(color #[0-9A-F]{8}\)\)\)\)\)\)\)
"""#)
#expect(displayList.description.contains(expectRegex))
}

@Test
func nestedMultiViewRoot() {
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@augmentcode augmentcode bot Feb 14, 2026

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Since this PR adds only the repro test, if the underlying crash is still present this will abort the whole test run (fatal error) rather than reporting a normal test failure; is this intended to land only together with the fix or be marked as an expected failure until then?

Severity: medium

Other Locations
  • Tests/OpenSwiftUICoreTests/View/VariadicViewTests.swift:26

Fix This in Augment

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struct ContentView: View {
var body: some View {
_VariadicView.Tree(PassthroughMultiViewRoot()) {
_VariadicView.Tree(PassthroughMultiViewRoot()) {
Color.red
Color.blue
}
}
}
}

let graph = ViewGraph(
rootViewType: ContentView.self,
requestedOutputs: [.displayList]
)
graph.instantiateOutputs()
graph.setRootView(ContentView())
graph.setProposedSize(CGSize(width: 100, height: 100))
let (displayList, _) = graph.displayList()
let expectRegex = try! Regex(
#"""
\(display-list
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(effect
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(effect
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(content-seed \d+\)
\(color #[0-9A-F]{8}\)\)\)\)
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(effect
\(item #:identity \d+ #:version \d+
\(frame \([^)]+\)\)
\(content-seed \d+\)
\(color #[0-9A-F]{8}\)\)\)\)\)\)\)
"""#)
#expect(displayList.description.contains(expectRegex))
}
#endif
}
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