#line macro cannot access original location inside of body macro

[fthdgn]

Description

#line value is wrong inside of body macro, even after using #sourceLocation to fix it.

Steps to Reproduce

I will use this macro implementation from #2757. It is only online example I can found which uses sourceLocation.

@attached(body)
public macro SourceLocationMacro(_ properties: String...) =
    #externalMacro(module: "MyMacros", type: "SourceLocationMacro")

public struct SourceLocationMacro: BodyMacro {
    public static var formatMode: FormatMode { .disabled }
    public static func expansion(of node: AttributeSyntax, providingBodyFor declaration: some DeclSyntaxProtocol & WithOptionalCodeBlockSyntax, in context: some MacroExpansionContext) throws -> [CodeBlockItemSyntax] {
        
        if let statements = declaration.body?.statements {
            var body: [CodeBlockItemSyntax] = []
            statements.forEach { statement in
                if let location = context.location(of: statement, at: .afterLeadingTrivia, filePathMode: .filePath) {
                    let transformed = CodeBlockItemListSyntax {
                        "\n#sourceLocation(file: \(location.file), line: \(location.line))"
                        statement
                        "\n#sourceLocation()"
                    }
                    body.append(contentsOf: transformed)
                }
            }
            return body
        } else {
            return []
        }
    }
}

    // this line is 237 on original source code
    @SourceLocationMacro
    func demo() {
        let x: Int = 1
        print("demo line", #line)
    }

Expanded macro

{

#sourceLocation(file: "/***/AppDelegate.swift", line: 240)
        let x: Int = 1
#sourceLocation()
#sourceLocation(file: "/***/AppDelegate.swift", line: 241)
        print("demo line", #line)
#sourceLocation()
}

On this example sourceLocation does something, it makes Xcode to jump correct line on from the build warning about unused variable. This is the original purpose of the issue #2757. If the macro does not insert sourceLocation lines, the Xcode jumps to a generated code snippet.

My problem is that, sourceLocation does not fix #line value. It prints 239 instead of 241.