fix: preserve project FSharp.Core reference

src/Fable.Compiler/ProjectCracker.fs

@@ -1002,7 +1002,6 @@ let getFullProjectOpts (resolver: ProjectCrackerResolver) (opts: CrackerOptions)
             let ignoredRefs =
                 HashSet
                     [
-                        "FSharp.Core"
                         "WindowsBase"
                         "Microsoft.Win32.Primitives"
                         "Microsoft.VisualBasic"
@@ -1027,14 +1026,7 @@ let getFullProjectOpts (resolver: ProjectCrackerResolver) (opts: CrackerOptions)
 
         let projRefs = projRefs |> List.map (fun p -> p.ProjectFile)
 
-        let otherOptions =
-            [|
-                yield! otherOptions
-                yield! dllRefs
-                // For some reason, in my tests it seems to work without the FSharp.Core reference
-                // but we add it just in case
-                yield "-r:" + typeof<FSharp.Collections.List<obj>>.Assembly.Location
-            |]
+        let otherOptions = [| yield! otherOptions; yield! dllRefs |]
 
         let outputType =
             match mainProj.OutputType with

tests/Integration/Integration/data/taskNetstandard/TaskBuilder.fs

@@ -0,0 +1,16 @@
+module TaskBuilder
+
+open System.Threading.Tasks
+
+let run shouldThrow : Task<Result<int, exn>> =
+    task {
+        let! value = Task.FromResult 42
+
+        try
+            if shouldThrow then
+                failwith "boom"
+
+            return Ok value
+        with error ->
+            return Error error
+    }

tests/Integration/Integration/data/taskNetstandard/TaskBuilder.jsx.expected

@@ -0,0 +1,13 @@
+
+import { task } from "./fable_modules/fable-library-js.5.15.0/TaskBuilder.js";
+import { fromResult } from "./fable_modules/fable-library-js.5.15.0/Task.js";
+import { Exception } from "./fable_modules/fable-library-js.5.15.0/Util.js";
+import { FSharpResult$2 } from "./fable_modules/fable-library-js.5.15.0/Result.js";
+
+export function run(shouldThrow) {
+    const builder$0040 = task();
+    return builder$0040.Run(builder$0040.Delay(() => builder$0040.Bind(fromResult(42), (_arg) => builder$0040.TryWith(builder$0040.Delay(() => builder$0040.Combine(shouldThrow ? (((() => {
+        throw new Exception("boom");
+    })(), builder$0040.Zero())) : builder$0040.Zero(), builder$0040.Delay(() => builder$0040.Return(new FSharpResult$2(/* Ok */ 0, [_arg]))))), (_arg_1) => builder$0040.Return(new FSharpResult$2(/* Error */ 1, [_arg_1]))))));
+}
+

tests/Integration/Integration/data/taskNetstandard/taskNetstandard.fsproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="TaskBuilder.fs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FSharp.Core" Version="6.0.0" />
+  </ItemGroup>
+
+</Project>