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Incorrect serialization using fsi and Newtonsoft on dotnet 6.0.3xx #13493
Description
Install dotnet 6.0.301 on Linux. I have tried Ubuntu and Debian on WSL.
sudo apt install dotnet-sdk-6.0
Run this script using dotnet fsi
#r "nuget:Newtonsoft.Json"
open Newtonsoft.Json
JsonConvert.SerializeObject {| x = 1 |}
|> printfn "%s"
or
type R = { x: int }
JsonConvert.SerializeObject { x = 1 } |> printfn "%s"
In either case output is
{"x@":1,"x":1}
Install 6.0.203
sudo apt install dotnet-sdk-6.0=6.0.203-1
output is
{"x":1}
Serialization is correct on Windows, and when using a regular class, only records in scripts are affected
Workaround
Use dotnet fsi --multiemit-
Activity
[-]Incorrect serialization using Newtonsoft on dotnet 6.0.3xx[/-][+]Incorrect serialization using fsi and Newtonsoft on dotnet 6.0.3xx[/+]dsyme commentedon Jul 11, 2022
@JonCanning Thank you.
As a workaround, using
dotnet fsi --multiemit-makes the problem go away. You will lose debug symbols for scripts but that's all.dsyme commentedon Jul 11, 2022
The problem is related to this line:
fsharp/src/Compiler/CodeGen/IlxGen.fs
Line 2079 in 9df7080
There's a related line we need to check here: https://github.com/dotnet/fsharp/blob/main/src/Compiler/CodeGen/IlxGen.fs#L10675