False positive for CS1503 with MSBuild 17.10, but not dotnet build #72098

virzak · 2024-02-14T15:51:55Z

This used to work in versions prior to 17.10. Might be related to dotnet/sdk#38777

Version Used: 17.10.0-preview-24101-01+07fd5d51f

Steps to Reproduce:

This code compiles fine with dotnet build, but not msbuild

using System;
using System.Collections;


MyClass.CallFunctionWithIList([new Element()]);

public class MyClass
{
    public static void CallFunctionWithIList(ElementCollection list)
    {
    }
}

public class Element{}

public class ElementCollection : IEnumerable
{
    public IEnumerator GetEnumerator()
    {
        throw new NotImplementedException();
    }
    public void Add(Element element){}
}

Diagnostic Id: CS1503

Expected Behavior:

msbuild                                                                                                                                                                  pwsh   100  10:45:51 
MSBuild version 17.9.2+bb6fadf23 for .NET Framework
Build started 2024-02-14 10:45:53.

Project "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj" on node 1 (default targets).
_CheckForNETCoreSdkIsPreview:
C:\Program Files\dotnet\sdk\8.0.200-preview.23624.5\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(311,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [\\tscli
ent\Q\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj]
_GenerateSourceLinkFile:
  Source Link is empty, file 'obj\Debug\net8.0\CS1503-FalsePositive.sourcelink.json' does not exist.
CoreCompile:
  C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin\Roslyn\csc.exe /noconfig /unsafe- /checked- /nowarn:1701,1702,1701,1702 /fullpaths /nostdlib+ /errorreport:prompt /warn:8 /define:TRACE;DEBUG;NET;NET8_0;NETCOREAPP;NET5_0_OR_G
  REATER;NET6_0_OR_GREATER;NET7_0_OR_GREATER;NET8_0_OR_GREATER;NETCOREAPP1_0_OR_GREATER;NETCOREAPP1_1_OR_GREATER;NETCOREAPP2_0_OR_GREATER;NETCOREAPP2_1_OR_GREATER;NETCOREAPP2_2_OR_GREATER;NETCOREAPP3_0_OR_GREATER;NETCOREAPP3_1_OR_GREATER /highentropyv
  a+ /nullable:enable /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.0\ref\net8.0\Microsoft.CSharp.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.0\ref\net8.0\Microsoft.VisualBasic.Core.dll" /refe
  rence:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.0\ref\net8.0\Microsoft.VisualBasic.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.0\ref\net8.0\Microsoft.Win32.Primitives.dll" /reference:"C:\Program Fi
  les\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.0\ref\net8.0\Microsoft.Win32.Registry.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.0\ref\net8.0\mscorlib.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.
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  error+:NU1605,SYSLIB0011
  CompilerServer: server - server processed compilation - dd7bf814-2317-4152-b6c5-45a13ee1f8de
_CopyOutOfDateSourceItemsToOutputDirectory:
  Copying file from "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\obj\Debug\net8.0\apphost.exe" to "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\bin\Debug\net8.0\CS1503-FalsePositive.exe".
CopyFilesToOutputDirectory:
  Copying file from "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\obj\Debug\net8.0\CS1503-FalsePositive.dll" to "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\bin\Debug\net8.0\CS1503-FalsePositive.dll".
  Copying reference assembly from "obj\Debug\net8.0\refint\CS1503-FalsePositive.dll" to "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\obj\Debug\net8.0\ref\CS1503-FalsePositive.dll".
  CS1503-FalsePositive -> \\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\bin\Debug\net8.0\CS1503-FalsePositive.dll
  Copying file from "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\obj\Debug\net8.0\CS1503-FalsePositive.pdb" to "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\bin\Debug\net8.0\CS1503-FalsePositive.pdb".
Done Building Project "\\tsclient\Q\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj" (default targets).


Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:16.34

Actual Behavior:

msbuild
MSBuild version 17.10.0-preview-24081-01+97651a25d for .NET Framework
Build started 2024-02-14 10:47:49 AM.

Project "Q:\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj" on node 1 (default targets).
_CheckForNETCoreSdkIsPreview:
C:\Program Files\dotnet\sdk\9.0.100-preview.1.24101.2\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(313,5): message NETSDK1057: You
 are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [Q:\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj]
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  Source Link is empty, file 'obj\Debug\net8.0\CS1503-FalsePositive.sourcelink.json' does not exist.
CoreCompile:
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  lign:512 /optimize- /out:obj\Debug\net8.0\CS1503-FalsePositive.dll /refout:obj\Debug\net8.0\refint\CS1503-FalsePositive.dll /target:exe /warnaserror- /utf8output /
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  net/cs/Microsoft.Interop.JavaScript.JSImportGenerator.dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.1\analyzers/dotnet/cs/Microsoft.I
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  dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.1\analyzers/dotnet/cs/System.Text.Json.SourceGeneration.dll" /analyzer:"C:\Program File
  s\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.1\analyzers/dotnet/cs/System.Text.RegularExpressions.Generator.dll" Program.cs obj\Debug\net8.0\CS1503-FalsePositive.G
  lobalUsings.g.cs "obj\Debug\net8.0\.NETCoreApp,Version=v8.0.AssemblyAttributes.cs" obj\Debug\net8.0\CS1503-FalsePositive.AssemblyInfo.cs /warnaserror+:NU1605,SYSLI
  B0011
Q:\Code\Sandbox\CS1503-FalsePositive\Program.cs(7,31): error CS1503: Argument 1: cannot convert from 'collection expressions' to 'ElementCollection' [Q:\Code\Sandbox
\CS1503-FalsePositive\CS1503-FalsePositive.csproj]
  CompilerServer: server - server processed compilation - 23b50330-b470-43ec-a0f0-6842102f81f4
Done Building Project "Q:\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj" (default targets) -- FAILED.


Build FAILED.

"Q:\Code\Sandbox\CS1503-FalsePositive\CS1503-FalsePositive.csproj" (default target) (1) ->
(CoreCompile target) ->
  Q:\Code\Sandbox\CS1503-FalsePositive\Program.cs(7,31): error CS1503: Argument 1: cannot convert from 'collection expressions' to 'ElementCollection' [Q:\Code\Sandb
ox\CS1503-FalsePositive\CS1503-FalsePositive.csproj]

    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:07.42

The text was updated successfully, but these errors were encountered:

cston · 2024-02-14T18:07:16Z

@virzak, thanks for reporting this issue.

In 17.10 and later, conversion of a collection expression to a type that implements IEnumerable and does not have a CollectionBuilderAttribute requires that the type has an Add method that takes an argument of the iteration type of the type - see breaking change.

For this particular example, ElementCollection could implement IEnumerable<Element> or an Add(object) overload could be added.

virzak · 2024-02-14T18:50:04Z

In that case should IDE0028 shouldn't show up for cases like this.

Also shows up in SharpLab:

Here is a common scenario for context.
https://github.com/microsoft/perfview/blob/f312aef7c4e415557899bf1303c98b7d48b05612/src/PerfView/GuiUtilities/TextEditor/TextEditorControl.xaml.cs#L206-L207

Also why doesn't dotnet build throw that error?

🚀  dotnet build
MSBuild version 17.10.0-preview-24101-01+07fd5d51f for .NET
Restore complete (0.6s)
You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy
  CS1503-FalsePositive succeeded (6.2s) → bin\Debug\net8.0\CS1503-FalsePositive.dll

Build succeeded in 8.0s

aelij · 2024-02-18T14:19:52Z

@jcouv I'm also seeing this behavior, and it's a regression from 17.9. The WPF class InputGestureCollection has an Add method, and it worked with collection initializers until I upgraded to 17.10p1. dotnet build works, even tried on the .NET 9.0.100-preview1 SDK.

CyrusNajmabadi · 2024-02-18T16:48:07Z

@MadsTorgersen @KathleenDollard real world cases where this caused breaking changes. These examples seem very reasonable to be. They are places where a collection initializer would be legal. The original rules for collection expressions thus also were legal. But our recent restriction now breaks things.

I don't love that we're breaking code, and that collection expressions don't live up to their original promise (a unified way to write collections that can handle the prior ways we had in the language).

cston · 2024-02-18T16:50:03Z

@aelij, this is the expected behavior in 17.10 with the breaking change.

InputGestureCollection implements IEnumerable and has an Add(InputGesture) method, but the collection expression conversion now requires an accessible Add(object) since the iteration type of the collection type is object.

dotnet build works, even tried on the .NET 9.0.100-preview1 SDK.

It looks like the .NET 9.0.100-preview.1 SDK is using an earlier commit of Roslyn, and does not include this change.

CyrusNajmabadi · 2024-02-18T17:51:03Z

Started an internal discussion on this topic. Will escalate this to the LDM asap.

CyrusNajmabadi · 2024-02-18T17:58:36Z

@cston The problem here is that that strict rules cuts out many normal collection types that were not generic. They are IEnumerable (The normal iteration type of the time), but have strongly typed Add methods so people wouldn't add inappropriate elements to them. These types worked fine with collection-initializers, and the initial shipping form of collection-expressions.

Unfortunately, requiring that Add take an object here is an actual negative as it would make these types not strongly typed wrt to being able to add to them.

In the internal email i've proposed that if the type implements IEnumerable (but not IEnumerable<T>), then we relax things here, and we allow the Add method to not have to strictly match the element type. It just needs to be able to convert to it.

jnm2 · 2024-02-18T18:09:08Z

Since nongeneric collections often indicated element type through the indexer property type, that would be the moral equivalent of determing the T in IEnumerable<T> to use to require Add(T) to exist.

CyrusNajmabadi · 2024-02-18T18:28:41Z

Since nongeneric collections often indicated element type through the indexer property type, that would be the moral equivalent of determing the T in IEnumerable<T> to use to require Add(T) to exist.

@jnm2 I like that idea. I Will raise it internally!

CyrusNajmabadi · 2024-02-18T23:28:27Z

@jnm2 I've sent out that idea. Note: i prefer your idea a lot as:

it ties the collection expression design more closely with that of list-patterns, which already says:

A list_pattern is compatible with any type that is countable as well as indexable — it has an accessible indexer that takes an Index as an argument or otherwise an accessible indexer with a single int parameter. If both indexers are present, the former is preferred.

several of the types i've looked at have multiple overloads of Add. Specifically the Add method can often take a string instead of a strongly typed UI element, leading to an open question of which parameter type applies. However, with the indexer, we are starting from looking just at the indexer that takes an int (the indexable requirement), and looking just at the indexer's type.

--

The open question, in my mind, is whether we are going the route of saying:

the collection type's element type is object, but you are allowed to call .Add methods that take a more specific type. OR:
the collection type's element type is the strongly typed type of its T this[int i] { get; } indexer.

In other words, both approaches would allow this to work. But each would be saying something quite different about the element type. Personally, i prefer '2' as it really seems to convey the type information that these types were trying to convey in the pre-generics world.

Tagging @RikkiGibson as well.

CyrusNajmabadi · 2024-02-18T23:28:37Z

And @333fred :)

aelij · 2024-02-19T07:03:23Z

@cston Thanks for the explanation. BTW that document is not very visible. It would be helpful to publish such breaking changes under https://learn.microsoft.com/en-us/dotnet/core/compatibility/8.0

See dotnet/roslyn#72098 (comment) Add links from the .NET breaking changes articles to the corresponding C# compiler breaking changes articles.

jcouv · 2024-02-27T22:31:48Z

@aelij FYI, a link is being added in dotnet/docs#39681
Thanks for the suggestion

* Add links to C# compiler breaks See dotnet/roslyn#72098 (comment) Add links from the .NET breaking changes articles to the corresponding C# compiler breaking changes articles. * fix warnings. * fix links again. * respond to feedback.

Spec changes: dotnet/csharplang#8022 Fixes dotnet#72098

dotnet-issue-labeler bot added Area-Compilers untriaged Issues and PRs which have not yet been triaged by a lead labels Feb 14, 2024

jcouv added Feature - Collection Expressions Resolution-Answered The question has been answered labels Feb 14, 2024

BillWagner added a commit to BillWagner/docs that referenced this issue Feb 27, 2024

Add links to C# compiler breaks

81db263

See dotnet/roslyn#72098 (comment) Add links from the .NET breaking changes articles to the corresponding C# compiler breaking changes articles.

BillWagner mentioned this issue Feb 27, 2024

Add links to C# compiler breaks dotnet/docs#39681

Merged

jaredpar self-assigned this Mar 1, 2024

jaredpar mentioned this issue Mar 26, 2024

Code fix for IDE0028 produces invalid collection expression #71240

Closed

cston mentioned this issue Mar 26, 2024

Collection expressions: require Add method callable with a single argument for class and struct types that do not use [CollectionBuilder] #72654

Merged

jaredpar mentioned this issue Mar 26, 2024

Code using collection expression that compiled in .NET 8/.NET 9 preview.1 produces CS9215 in .NET 9 preview.2 #72668

Closed

AlekseyTs added a commit to AlekseyTs/roslyn that referenced this issue Mar 28, 2024

Params side of the design chnages around Add methods

edaf605

Spec changes: dotnet/csharplang#8022 Fixes dotnet#72098

AlekseyTs added a commit to AlekseyTs/roslyn that referenced this issue Mar 28, 2024

Params side of the design chnages around Add methods

7a4fcb0

Spec changes: dotnet/csharplang#8022 Fixes dotnet#72098

AlekseyTs mentioned this issue Mar 28, 2024

Params side of the design changes around Add methods #72771

Merged

cston mentioned this issue Mar 29, 2024

Collection expressions: require Add method callable with a single argument for class and struct types that do not use [CollectionBuilder] #72796

Merged

dotnet-bot closed this as completed in eadc0cc Apr 2, 2024

cston mentioned this issue Apr 4, 2024

[Proposal]: Relax Add requirement for collection expression conversions to types implementing IEnumerable dotnet/csharplang#8034

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False positive for CS1503 with MSBuild 17.10, but not dotnet build #72098

False positive for CS1503 with MSBuild 17.10, but not dotnet build #72098

virzak commented Feb 14, 2024

cston commented Feb 14, 2024 •

edited

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virzak commented Feb 14, 2024

aelij commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

cston commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

jnm2 commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

aelij commented Feb 19, 2024

jcouv commented Feb 27, 2024

False positive for CS1503 with MSBuild 17.10, but not dotnet build #72098

False positive for CS1503 with MSBuild 17.10, but not dotnet build #72098

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virzak commented Feb 14, 2024

cston commented Feb 14, 2024 • edited Loading

virzak commented Feb 14, 2024

aelij commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

cston commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

jnm2 commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

CyrusNajmabadi commented Feb 18, 2024

aelij commented Feb 19, 2024

jcouv commented Feb 27, 2024

cston commented Feb 14, 2024 •

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