Starting: Build
    ==============================================================================
    Task         : MSBuild
    Description  : Build with MSBuild
    Version      : 1.179.0
    Author       : Microsoft Corporation
    Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/build/msbuild
    ==============================================================================
    /Library/Frameworks/Mono.framework/Versions/Current/Commands/msbuild /version /nologo
    /Library/Frameworks/Mono.framework/Versions/Current/Commands/msbuild /Users/runner/work/1/s/repro-dotnet-5-mac.csproj
    Microsoft (R) Build Engine version 16.6.0 for Mono
    Copyright (C) Microsoft Corporation. All rights reserved.

    Build started 2/9/2021 4:10:29 AM.
    Restoring packages for /var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/NuGetScratch/25b452314b6748e2ae47acfeeff57bfb/d32d6f5b3e69424b8453584b01696220.proj...
      GET https://api.nuget.org/v3-flatcontainer/msbuild.sdk.extras/index.json
      OK https://api.nuget.org/v3-flatcontainer/msbuild.sdk.extras/index.json 73ms
      GET https://api.nuget.org/v3-flatcontainer/msbuild.sdk.extras/3.0.23/msbuild.sdk.extras.3.0.23.nupkg
      OK https://api.nuget.org/v3-flatcontainer/msbuild.sdk.extras/3.0.23/msbuild.sdk.extras.3.0.23.nupkg 6ms
    Installing MSBuild.Sdk.Extras 3.0.23.
    Project "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" on node 1 (default targets).
    Project "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (1) is building "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (1:4) on node 1 (Build target(s)).
    /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/msbuild/Current/bin/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(127,5): error NETSDK1045: The current .NET SDK does not support targeting .NET Core 5.0.  Either target .NET Core 3.1 or lower, or use a version of the .NET SDK that supports .NET Core 5.0. [/Users/runner/work/1/s/repro-dotnet-5-mac.csproj]
    Done Building Project "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (Build target(s)) -- FAILED.
    Project "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (1) is building "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (1:5) on node 1 (Build target(s)).
    PrepareForBuild:
      Creating directory "bin/Debug/xamarin.ios10/".
      Creating directory "obj/Debug/xamarin.ios10/".
    _BeforeCoreCompileInterfaceDefinitions:
    Skipping target "_BeforeCoreCompileInterfaceDefinitions" because it has no inputs.
    _BeforeCoreCompileInterfaceDefinitions:
    Skipping target "_BeforeCoreCompileInterfaceDefinitions" because it has no inputs.
    _BeforeCoreCompileInterfaceDefinitions:
    Skipping target "_BeforeCoreCompileInterfaceDefinitions" because it has no inputs.
    _CoreCompileInterfaceDefinitions:
    Skipping target "_CoreCompileInterfaceDefinitions" because it has no inputs.
    _BeforeCoreCompileImageAssets:
    Skipping target "_BeforeCoreCompileImageAssets" because it has no inputs.
    _BeforeCoreCompileImageAssets:
    Skipping target "_BeforeCoreCompileImageAssets" because it has no inputs.
    _BeforeCoreCompileImageAssets:
    Skipping target "_CoreOptimizePropertyLists" because it has no inputs.
    _CoreOptimizeLocalizationFiles:
    Skipping target "_CoreOptimizeLocalizationFiles" because it has no inputs.
    /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/msbuild/Current/bin/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error NETSDK1004: Assets file '/Users/runner/work/1/s/obj/project.assets.json' not found. Run a NuGet package restore to generate this file. [/Users/runner/work/1/s/repro-dotnet-5-mac.csproj]
    Done Building Project "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (Build target(s)) -- FAILED.
    Done Building Project "/Users/runner/work/1/s/repro-dotnet-5-mac.csproj" (default targets) -- FAILED.