F#: the namespace is not defined

Question

I have this F# project Rm.Accounting.Domain with the following files (and in that order):

Model.fs: module Rm.Accounting.Domain.Model
Commands.fs: module Rm.Accounting.Domain.Commands
Events.fs: module Rm.Accounting.Domain.Events

and the last one causing problems Behaviour.fs:

module Rm.Accounting.Domain.Behaviour

open Rm.Accounting.Domain.Commands
open Rm.Accounting.Domain.Events
open Rm.Accounting.Infrastructure

let a = 42

Which leads to two errors:

Behaviour.fs(3, 20): [FS0039] The namespace 'Domain' is not defined. -> open Rm.Accounting.Domain.Commands
Behaviour.fs(4, 20): [FS0039] The namespace 'Domain' is not defined. -> open Rm.Accounting.Domain.Events

Without that file Behaviour.fs the project can compile, I am not sure to understand why those two imports cause some troubles.

@FyodorSoikin "and the last one causing problems Behaviour.fs:" — Natalie Perret
– Natalie Perret, Commented Jun 5, 2019 at 21:42

Natalie Perret · Accepted Answer · 2019-06-05 21:49:35Z

7

Thanks to the comments, it seems that for some reasons despite reordering files in Rider, the fsproj didn't really get updated right.

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <TargetFramework>netstandard2.0</TargetFramework>
    </PropertyGroup>

    <ItemGroup>
        <Compile Include="Behaviour.fs" />
        <Compile Include="Model.fs" />
        <Compile Include="Commands.fs" />
        <Compile Include="Events.fs" />
    </ItemGroup>

    <ItemGroup>
      <ProjectReference Include="..\Rm.Accounting.Infrastructure\Rm.Accounting.Infrastructure.fsproj" />
    </ItemGroup>

</Project>

Re-organising the fsproj, did the trick:

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <TargetFramework>netstandard2.0</TargetFramework>
    </PropertyGroup>

    <ItemGroup>
        <Compile Include="Model.fs" />
        <Compile Include="Commands.fs" />
        <Compile Include="Events.fs" />
        <Compile Include="Behaviour.fs" />
    </ItemGroup>

    <ItemGroup>
      <ProjectReference Include="..\Rm.Accounting.Infrastructure\Rm.Accounting.Infrastructure.fsproj" />
    </ItemGroup>

</Project>

answered Jun 5, 2019 at 21:49

Natalie Perret

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3 Comments

Jim Foye Over a year ago

I've seen this behavior in Visual Studio before (I know you're using Rider, but just FYI).

Natalie Perret Over a year ago

@JimFoye that's good to know, just in case the same behaviour occurs in VS, I will know where to look for.

AlignedDev Over a year ago

I just got this in VS Code as well

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