error: failed to produce diagnostic for expression

[gaultier]

Description
The compiler fails to build a simple one file program and halts with this error.

Steps to reproduce

import Foundation

var input = try! String(contentsOffile: CommandLine.arguments[1], encoding: String.Encoding.utf8)
let lines = input.split(separator: "\n")

for (_, line) in lines.enumerated() {
    print(line)
}

Command:

$ swiftc program.swift
/tmp/bug.swift:3:18: error: no exact matches in call to initializer
var input = try! String(contentsOffile: CommandLine.arguments[1], encoding: String.Encoding.utf8)
                 ^
Foundation.String:14:12: note: incorrect labels for candidate (have: '(contentsOffile:encoding:)', expected: '(contentsOfFile:encoding:)')
    public init(contentsOfFile path: __shared String, encoding enc: String.Encoding) throws
           ^
Foundation.String:23:12: note: incorrect labels for candidate (have: '(contentsOffile:encoding:)', expected: '(cString:encoding:)')
    public init?(cString: String, encoding enc: String.Encoding)
           ^
/tmp/bug.swift:6:1: error: failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project
for (_, line) in lines.enumerated() {
^

Expected behavior

The source code is wrong since it should be contentsOfFile not contentsOffile as pointed out by the first error message, so that part is fine.

The issue is with the last error message.I am not sure why it gets printed, maybe nothing should be printed? Or unable to infer type for expression due to a previous error perhaps.

Environment

• Swift compiler version info

swift-driver version: 1.62.15 Apple Swift version 5.7.1 (swiftlang-5.7.1.135.3 clang-1400.0.29.51)
Target: x86_64-apple-macosx12.0

• Xcode version info

Xcode 14.1
Build version 14B47b

• Deployment target: macOS 12.6.1

All done on the command line (no Xcode involved).

[LucianoPAlmeida]

I think this was fixed by #60062
Can you verify using the latest snapshot from main and close? Thanks

[gaultier]

Confirmed to be fixed with

$ xcrun -sdk macosx  ../build/Ninja-RelWithDebInfoAssert/swift-macosx-x86_64/bin/swiftc --version
Swift version 5.8-dev (LLVM 18bbb58dec87a5a, Swift 4ca5d1e7ee533c5)
Target: x86_64-apple-macosx12.0

It outputs with the sample program from above:

/Users/pgaultier/scratch/bug.swift:3:18: error: no exact matches in call to initializer
var input = try! String(contentsOffile: CommandLine.arguments[1], encoding: String.Encoding.utf8)
                 ^
Foundation.String:14:12: note: incorrect labels for candidate (have: '(contentsOffile:encoding:)', expected: '(contentsOfFile:encoding:)')
    public init(contentsOfFile path: __shared String, encoding enc: String.Encoding) throws
           ^
Foundation.String:23:12: note: incorrect labels for candidate (have: '(contentsOffile:encoding:)', expected: '(cString:encoding:)')
    public init?(cString: String, encoding enc: String.Encoding)