Variable used before declaration cause crash in runtime on access, instead compilation error

[krzyzanowskim]

Description

The variable used before declaration cause a crash in runtime on access instead of a compilation error.
Weird: It does not crash when build SwiftPM manifest, but it also does not throw a compilation error, instead ignores the variable value (example by https://gist.github.com/rnapier/1bf7a85eea76dc76fc61ad6aa0808fd2

Reproduction

class Foo {
    var settings: [String]
    
    init(_ settings: [String]) {
        self.settings = settings
    }
}

let f = Foo(s)
print(f.settings)
let s = ["a","b","c"]

Stack dump

Terminated due to signal: SEGMENTATION FAULT (11)

Expected behavior

compilation error. variable s used before declared.

Environment

swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0

Additional information

No response

[snmb22]

Terminated due to signal: SEGMENTATION FAULT (11)