Crash when using Self in KeyPath expression #80669
Description
Description
The program crashes with Fatal error: could not demangle keypath type from '��.
Reproduction
public func type<Root, Value>(at keyPath: KeyPath<Root, Value>) -> Value.Type {
return Value.self
}
extension Int {
static func bar() {
print("Hello")
}
}
class Foo {
var int = 10
static func staticFunc() {
type(at: \Self.int).bar()
}
}
Foo.staticFunc() // crashespublic func type<Root, Value>(at keyPath: KeyPath<Root, Value>) -> Value.Type {
return Value.self
}
extension Int {
static func bar() {
print("Hello")
}
}
class Foo {
var int = 10
static func staticFunc() {
type(at: \Foo.int).bar()
}
}
Foo.staticFunc() // Prints `Hello` correctlyStack dump
#0 0x00000001adb1c95c in _swift_runtime_on_report ()
#1 0x00000001adbf49c8 in _swift_stdlib_reportFatalErrorInFile ()
#2 0x00000001ad7bc080 in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in Swift._assertionFailure(_: Swift.StaticString, _: Swift.String, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never ()
#3 0x00000001ad7bb1f8 in Swift._assertionFailure(_: Swift.StaticString, _: Swift.String, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never ()
#4 0x00000001ad8ed61c in Swift._resolveKeyPathGenericArgReference(_: Swift.UnsafeRawPointer, genericEnvironment: Swift.Optional<Swift.UnsafeRawPointer>, arguments: Swift.Optional<Swift.UnsafeRawPointer>) -> Swift.UnsafeRawPointer ()
#5 0x00000001ad8ed9cc in generic specialization <Swift.GetKeyPathClassAndInstanceSizeFromPattern> of Swift._walkKeyPathPattern<τ_0_0 where τ_0_0: Swift.KeyPathPatternVisitor>(_: Swift.UnsafeRawPointer, walker: inout τ_0_0) -> () ()
#6 0x00000001ad8ece30 in Swift._getKeyPathClassAndInstanceSizeFromPattern(Swift.UnsafeRawPointer, Swift.UnsafeRawPointer) -> (keyPathClass: Swift.AnyKeyPath.Type, rootType: Any.Type, size: Swift.Int, alignmentMask: Swift.Int) ()
#7 0x00000001ad8ecc04 in Swift._swift_getKeyPath(pattern: Swift.UnsafeMutableRawPointer, arguments: Swift.UnsafeRawPointer) -> Swift.UnsafeRawPointer ()
Expected behavior
No crash should happen
Environment
Swift compiler in toolchain shipped with Xcode 16.3 (16E140)
Additional information
No response