Update SBRP to 1.0.0-beta.20574.1

[dseefeld]

This is the version that is now building with 5.0 tools.

dotnet/source-build-reference-packages#197

Uses #1899.

[dagood]

Diff: dotnet/source-build-reference-packages@fe6afa2...c52443b (just the 5.0 prev-sb, no other commits)

F# failed in CI, in the tarball builds:

FSharp.Core/Linq.fs(115,120): error FS0331: The implicit instantiation of a generic construct at or near this point could not be resolved because it could resolve to multiple unrelated types, e.g. 'ValueType' and 'IComparable'. Consider using type annotations to resolve the ambiguity [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Linq.fs(115,120): error FS0071: Type constraint mismatch when applying the default type 'IComparable' for a type inference variable. The type 'IComparable' is not compatible with the type 'ValueType' Consider adding further type constraints [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/QueryExtensions.fs(45,34): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/QueryExtensions.fs(50,34): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/QueryExtensions.fs(218,49): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(258,10): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(258,10): error FS0008: This runtime coercion or type test from type�    'a    � to �    QuerySource<'T,IEnumerable>    �involves an indeterminate type based on information prior to this program point. Runtime type tests are not allowed on some types. Further type annotations are needed. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(298,43): error FS0039: The namespace 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(320,27): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(322,10): error FS0001: This expression was expected to have type�    ''a -> 'b option'    �but here has type�    ''c option' [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(327,27): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(329,10): error FS0001: This expression was expected to have type�    ''a -> 'b option'    �but here has type�    ''c option' [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(334,27): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(336,10): error FS0001: This expression was expected to have type�    ''a -> 'b option'    �but here has type�    ''c option' [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(405,34): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(449,61): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(452,61): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(470,30): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(652,61): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1043,70): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1045,66): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1047,71): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1049,61): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1053,67): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1055,62): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1121,27): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1123,32): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1125,36): error FS0039: The value or constructor '|SpecificCallToMethod|_|' is not defined. Maybe you want one of the following:�   |SpecificCall|_|�   |SpecificCall1|_|�   |SpecificCall2|_|�   |SpecificCall3|_| [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1470,11): error FS0001: This expression was expected to have type�    'Expr -> 'a option'    �but here has type�    ''b option' [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fs(1815,15): error FS0039: The value, namespace, type or module 'LeafExpressionConverter' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/fslib-extra-pervasives.fs(278,39): error FS0039: The value, constructor, namespace or type 'QueryBuilder' is not defined. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Linq.fsi(5,1): error FS0240: The signature file 'Linq' does not have a corresponding implementation file. If an implementation file exists then check the 'module' and 'namespace' declarations in the signature and implementation files match. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]
FSharp.Core/Query.fsi(1,1): error FS0240: The signature file 'Query' does not have a corresponding implementation file. If an implementation file exists then check the 'module' and 'namespace' declarations in the signature and implementation files match. [/tb/tarball_898679/src/fsharp.da6be68280c89131cdba2045525b80890401defd/src/fsharp/FSharp.Core/FSharp.Core.fsproj]

Taking a look since I kinda recently moved it to net5.0. (Although that did get a green internal rolling build, so this isn't a case of should-have-been-a-merge-conflict.)

[dagood]

I grabbed the netstandard.dll from SBRP's NETStandard.Library.2.0.3 before and after this PR, and found this IL diff:
https://gist.github.com/dagood/4a3792f73ec7775f75e4f514a19a6157

In particular, I think this could cause the first error (and I think the rest are just pile-ons):
https://gist.github.com/dagood/4a3792f73ec7775f75e4f514a19a6157#file-netstandard-il-diff-L84-L90

 .class public auto ansi abstract sealed beforefieldinit System.Nullable
 	extends System.Object
 {
 	// Methods
 	.method public hidebysig static 
-		int32 Compare<(System.ValueType) T> (
+		int32 Compare<valuetype .ctor (System.ValueType) T> (

With decompilation to C# this shows up as:

-		public static int Compare<T>(T? n1, T? n2) where T : ValueType
+		public static int Compare<T>(T? n1, T? n2) where T : struct

The IL that's checked into SBRP includes valuetype .ctor:

  .method /*06000757*/ public hidebysig static 
          int32  Compare<valuetype .ctor (System.ValueType/*020000C7*/) T>(valuetype System.Nullable`1/*02000089*/<!!T> n1,
                                                                           valuetype System.Nullable`1/*02000089*/<!!T> n2) cil managed

Another ilasm regression? 😬

[dagood]

Filed dotnet/runtime#45183 for that, assuming it's the problem. I hope I'm wrong, but want to get eyes on this ASAP.