[Fable 4.3.0][F# 7.0] String interpolation shows error (but compiles fine)

[OkayX6]

Description

Hi,

I don't know why but I am getting this error everywhere in my Fable project in VS Code:

It used to work before upgrading either Dotnet or Fable.

The compilation works though with npm start

Repro code

My fsproj is configured like this:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <LangVersion>7.0</LangVersion>
  </PropertyGroup>
  <ItemGroup>

Expected and actual results

Should not appear.

Related information

• Fable version: dotnet fable --version: 4.3.0
• Operating system: Windows 11

[MangelMaxime]

Hello @OkayX6,

You seems to report an IDE errors and not a Fable error here.

Beside the LangVersion you also needs to checks which version of FSharp.Core you are using I believe string interpolation was introduce in version 5.0.0 or 5.0.2

[OkayX6]

Thanks @MangelMaxime
It appears it is Ionide that keeps referencing version 4.7.2, Rider fixed it automatically...