MethodMissingException in F # user code; as?

Question

MethodMissingException in F # user code; as?

I've written some simplified F # projects. Name them Console

and Library

.

Console

is a very simple console application netcoreapp2.0

. Here's the project file Console.fsproj

:

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <Compile Include="Program.fs" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="../Library/Library.fsproj" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="FSharp.Core" Version="4.1.*" />
    <PackageReference Include="FSharp.NET.Sdk" Version="1.0.*" PrivateAssets="All" />
  </ItemGroup>

</Project>

Source Program.fs

:

open System
open Library

[<EntryPoint>]
let main argv =
    let result = Stats.ema 0.0 [3.7; 8.9]
    0 // return an integer exit code

Now Library.fsproj

:

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

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

  <ItemGroup>
    <Compile Include="Library.fs" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="FSharp.Core" Version="4.1.*" />
    <PackageReference Include="FSharp.NET.Sdk" Version="1.0.*" PrivateAssets="All" />
  </ItemGroup>

</Project>

and Library.fs

:

module Library.Stats

let ema (prevEma:float) (values:float list) =
    0.0

I can rebuild both projects just fine (using nuget.org only) and the build also works well:

C:\Users\ben\proj\scratch
λ  dotnet build
Microsoft (R) Build Engine version 15.3.117.23532
Copyright (C) Microsoft Corporation. All rights reserved.

  Library -> C:\Users\ben\proj\scratch\src\Library\bin\Debug\netstandard2.0\Library.dll
  Console -> C:\Users\ben\proj\scratch\src\Console\bin\Debug\netcoreapp2.0\Console.dll

However, at runtime, the program throws out MissingMethodException

:

C:\Users\ben\proj\scratch\src\Console
λ  dotnet run

Unhandled Exception: System.MissingMethodException: Method not found: 'Double Library.Stats.ema(Double, Microsoft.FSharp.Collections.FSharpList`1<Double>)'.
   at Program.main(String[] argv)

Here's mine dotnet --info

:

C:\Users\ben\proj\scratch\src\Console
λ  dotnet --info
.NET Command Line Tools (2.0.0-preview1-005977)

Product Information:
 Version:            2.0.0-preview1-005977
 Commit SHA-1 hash:  414cab8a0b

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.15063
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\2.0.0-preview1-005977\

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.0-preview1-002111-00
  Build    : 1ff021936263d492539399688f46fd3827169983

What is causing this?

Update:

As you can see from the comments, I found that there were conflicting links System.Runtime

, not FSharp.Core

, and that links are being added somewhere in the SDK or snap-in.