ICSharpCode.Decompiler.Generators pins a stable Microsoft.CodeAnalysis.CSharp
(a source generator must not reference a Roslyn newer than the host compiler)
and ILSpy.AddIn.VS2022 pins a stable 4.0.1. Stable Roslyn lives only on
nuget.org, but the repo-root NuGet.config mapped Microsoft.CodeAnalysis.*
exclusively to the dotnet-tools feed, which carries only prerelease builds.
Both projects worked around that with a per-project NuGet.config. dotnet
restore honors it, since settings are computed per project directory, but
Visual Studio starts NuGet.config discovery at the solution directory and
never sees it: the first restore in VS on a machine with a cold NuGet cache
fails with NU1103 exactly as reported. Once any successful restore has put
the stable package into the global packages folder, source mapping is
satisfied from the cache and the problem never reappears on that machine,
which is why #3835 was closed as unreproducible.
NuGet consults every source that declares the longest pattern matching a
package id, so mapping Microsoft.CodeAnalysis.* to nuget.org as well as to
dotnet-tools makes both feeds available for the whole family: the stable
versions resolve from nuget.org and the prerelease $(RoslynVersion) from
dotnet-tools. Both per-project configs are then redundant and removed.
Verified with an empty NUGET_PACKAGES and the root config forced as the only
config (simulating VS's discovery): the old config reproduces the reported
NU1103; with the new config the generator, the decompiler tests (prerelease
Roslyn) and the VS add-in (stable 4.0.1 with its Workspaces dependencies)
all restore; restore.ps1 over ILSpy.sln leaves the lock files unchanged.
Assisted-by: Claude:claude-fable-5:Claude Code
The hook installs dotnet-format with --add-source, which NuGet rejects
when packageSourceMapping is configured. The dotnet10-transport feed is
already declared in NuGet.config; adding a dotnet-format mapping entry
there lets the install succeed without --add-source.
Assisted-by: Claude:claude-sonnet-4-6:GitHub Copilot
* .NET 11 RC2 minimal changes
* Heuristic for transport feed Roslyn selection
* Microsoft.CodeAnalysis.NetAnalyzers from main NuGet feed
* Use the VS2026 image
* Switch all test projects to net11
* Extract constants
* Include vsix with plain nuget.config files
Siegfried Pammer
Daniel Grunwald
Christoph Wille
Peter Crabtree
Andrew Au