9.0 Stage 2 Builds Failing in fsharp with `error FS0064`

[ellahathaway]

Link to failues (internal Microsoft link)

  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(26,36): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_codeopt has been constrained to be type 'Code'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(26,36): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_codeopt has been constrained to be type 'Code'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(26,46): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_Macros has been constrained to be type 'Macro list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(26,46): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_Macros has been constrained to be type 'Macro list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(26,55): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_Rules has been constrained to be type 'Rule list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(26,55): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_Rules has been constrained to be type 'Rule list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(36,26): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_macro has been constrained to be type 'Macro'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(36,26): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_macro has been constrained to be type 'Macro'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(41,31): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_regexp has been constrained to be type 'Regexp'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(41,31): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_regexp has been constrained to be type 'Regexp'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(46,26): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_rule has been constrained to be type 'Rule'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(46,26): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_rule has been constrained to be type 'Rule'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(52,30): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_args has been constrained to be type 'RuleArgument list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(52,30): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_args has been constrained to be type 'RuleArgument list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(52,33): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_clauses has been constrained to be type 'Clause list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(52,33): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_clauses has been constrained to be type 'Clause list'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fs(411,20): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_optbar has been constrained to be type 'unit'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fs(411,20): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_optbar has been constrained to be type 'unit'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(65,44): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_clause has been constrained to be type 'Clause'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(65,44): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_clause has been constrained to be type 'Clause'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(84,78): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_charset has been constrained to be type ''a -> 'b'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fsy(84,78): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype_charset has been constrained to be type ''a -> 'b'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]
  /vmr/src/fsharp/buildtools/fslex/fslexpars.fs(260,20): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype__startspec has been constrained to be type 'obj'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj] [/vmr/artifacts/source-built-sdks/Microsoft.DotNet.Arcade.Sdk/tools/Build.proj]
##[error]/vmr/src/fsharp/buildtools/fslex/fslexpars.fs(260,20): error FS0064: This construct causes code to be less generic than indicated by the type annotations. The type variable 'gentype__startspec has been constrained to be type 'obj'. [/vmr/src/fsharp/buildtools/fslex/fslex.fsproj]

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[ellahathaway]

@dotnet/fsharp - can you please take a look?

[vzarytovskii]

Feel free to put ignore for this error when you build (if you can, we have it as warning). Not yet sure what caused it.

[ellahathaway]

Had a discussion with @KevinRansom about this issue - it's likely related to this line from dotnet/fsharp#17649. The fsharp team is investigating.