Merge remote-tracking branch 'upstream/main' into record-unsafe-types

* upstream/main: (172 commits)
  Move impl of ILspWorkpace to EditorTestWorkspace/LspTestWorkspace (dotnet#76753)
  Field-backed properties: report diagnostic for variable named field declared in accessor (dotnet#76671)
  Add more tests
  Update 'use nameof instead of typeof' to support generic types
  Update dependencies from https://github.com/dotnet/arcade build 20250115.2
  Add docs
  invert
  Update src/Analyzers/CSharp/Tests/CSharpAnalyzers.UnitTests.projitems
  Update options
  Fixup tests
  fixup options
  Update tests
  Add test
  Fix trivia
  Handle params
  Support modifiers with simple lambda parameters. (dotnet#75400)
  Handle params
  Use helper
  Add fixes
  Flesh out
  ...

Author: 333fred

docs/Language Feature Status.md

@@ -10,7 +10,6 @@ efforts behind them.
 
 | Feature | Branch | State | Developer | Reviewer | IDE Buddy | LDM Champ |
 | ------- | ------ | ----- | --------- | -------- | --------- | --------- |
-| String literals in data section as UTF8 | [PR](https://github.com/dotnet/roslyn/pull/76036) | [In Progress](https://github.com/dotnet/roslyn/issues/76234) | [jjonescz](https://github.com/jjonescz) | [AlekseyTs](https://github.com/AlekseyTs), [jcouv](https://github.com/jcouv) | N/A | N/A |
 | Runtime Async | [features/runtime-async](https://github.com/dotnet/roslyn/tree/features/runtime-async) | [In Progress](https://github.com/dotnet/roslyn/issues/75960) | [333fred](https://github.com/333fred) | [jcouv](https://github.com/jcouv), [RikkiGibson](https://github.com/RikkiGibson) |  |  |
 | [Simple lambda parameters with modifiers](https://github.com/dotnet/csharplang/blob/main/proposals/simple-lambda-parameters-with-modifiers.md) | [PR](https://github.com/dotnet/roslyn/pull/75400) | [In Progress](https://github.com/dotnet/roslyn/issues/76298) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) | [jjonescz](https://github.com/jjonescz), [cston](https://github.com/cston) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) |
 | [Null-conditional assignment](https://github.com/dotnet/csharplang/issues/6045) | [null-conditional-assignment](https://github.com/dotnet/roslyn/tree/features/null-conditional-assignment) | [In Progress](https://github.com/dotnet/roslyn/issues/75554) | [RikkiGibson](https://github.com/RikkiGibson) | [cston](https://github.com/cston), [jjonescz](https://github.com/jjonescz) | TBD | [RikkiGibson](https://github.com/RikkiGibson) |
@@ -19,6 +18,7 @@ efforts behind them.
 | [`field` keyword in properties](https://github.com/dotnet/csharplang/issues/140) | [field-keyword](https://github.com/dotnet/roslyn/tree/features/field-keyword) | [Merged into 17.12p3](https://github.com/dotnet/roslyn/issues/57012) | [Youssef1313](https://github.com/Youssef1313), [cston](https://github.com/cston) | [333fred](https://github.com/333fred), [RikkiGibson](https://github.com/RikkiGibson) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) |
 | [First-class Span Types](https://github.com/dotnet/csharplang/issues/7905) | [FirstClassSpan](https://github.com/dotnet/roslyn/tree/features/FirstClassSpan) | [Merged into 17.13p1](https://github.com/dotnet/roslyn/issues/73445) | [jjonescz](https://github.com/jjonescz) | [cston](https://github.com/cston), [333fred](https://github.com/333fred) | | [333fred](https://github.com/333fred), [stephentoub](https://github.com/stephentoub) |
 | [Unbound generic types in `nameof`](https://github.com/dotnet/csharplang/issues/8480) | [PR](https://github.com/dotnet/roslyn/pull/75368) | [Merged into 17.13p2](https://github.com/dotnet/roslyn/pull/75368) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) | [jcouv](https://github.com/jcouv), [AlekseyTs](https://github.com/AlekseyTs) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) | [CyrusNajmabadi](https://github.com/CyrusNajmabadi) |
+| [String literals in data section as UTF8](https://github.com/dotnet/roslyn/blob/main/docs/features/string-literals-data-section.md) | [PR](https://github.com/dotnet/roslyn/pull/76036) | [Merged into 17.14p1](https://github.com/dotnet/roslyn/issues/76234) | [jjonescz](https://github.com/jjonescz) | [AlekseyTs](https://github.com/AlekseyTs), [cston](https://github.com/cston) | N/A | N/A |
 
 # Working Set VB
 

docs/compilers/CSharp/Compiler Breaking Changes - DotNet 10.md

@@ -2,6 +2,31 @@
 
 This document lists known breaking changes in Roslyn after .NET 9 general release (.NET SDK version 9.0.100) through .NET 10 general release (.NET SDK version 10.0.100).
 
+## `scoped` in a lambda parameter list is now always a modifier.
+
+***Introduced in Visual Studio 2022 version 17.13***
+
+C# 14 introduces the ability to write a lambda with parameter modifiers, without having to specify a parameter type:
+https://github.com/dotnet/csharplang/blob/main/proposals/simple-lambda-parameters-with-modifiers.md
+
+As part of this work, a breaking change was accepted where `scoped` will always be treated as a modifier
+in a lambda parameter, even where it might have been accepted as a type name in the past.  For example:
+
+```c#
+var v = (scoped scoped s) => { ... };
+
+ref struct @scoped { }
+```
+
+In C# 14 this will be an error as both `scoped` tokens are treated as modifiers.  The workaround is to
+use `@` in the type name position like so:
+
+```c#
+var v = (scoped @scoped s) => { ... };
+
+ref struct @scoped { }
+```
+
 ## `Span<T>` and `ReadOnlySpan<T>` overloads are applicable in more scenarios in C# 14 and newer
 
 ***Introduced in Visual Studio 2022 version 17.13***
@@ -194,6 +219,61 @@ namespace Microsoft.CodeAnalysis;
 public class EmbeddedAttribute : Attribute {}
 ```
 
+## Expression `field` in a property accessor refers to synthesized backing field
+
+***Introduced in Visual Studio 2022 version 17.12***
+
+The expression `field`, when used within a property accessor, refers to a synthesized backing field for the property.
+
+The warning CS9258 is reported when the identifier would have bound to a different symbol with language version 13 or earlier.
+
+To avoid generating a synthesized backing field, and to refer to the existing member, use 'this.field' or '@field' instead.
+Alternatively, rename the existing member and the reference to that member to avoid a conflict with `field`.
+
+```csharp
+class MyClass
+{
+    private int field = 0;
+
+    public object Property
+    {
+        get
+        {
+            // warning CS9258: The 'field' keyword binds to a synthesized backing field for the property.
+            // To avoid generating a synthesized backing field, and to refer to the existing member,
+            // use 'this.field' or '@field' instead.
+            return field;
+        }
+    }
+}
+```
+
+## Variable named `field` disallowed in a property accessor
+
+***Introduced in Visual Studio 2022 version 17.14***
+
+The expression `field`, when used within a property accessor, refers to a synthesized backing field for the property.
+
+The error CS9272 is reported when a local, or a parameter of a nested function, with the name `field` is declared in a property accessor.
+
+To avoid the error, rename the variable, or use `@field` in the declaration.
+
+```csharp
+class MyClass
+{
+    public object Property
+    {
+        get
+        {
+            // error CS9272: 'field' is a keyword within a property accessor.
+            // Rename the variable or use the identifier '@field' instead.
+            int field = 0;
+            return @field;
+        }
+    }
+}
+```
+
 ## `record` and `record struct` types cannot define pointer type members, even when providing their own Equals implementations
 
 ***Introduced in Visual Studio 2022 version 17.14***