…lambdas

Update static lambdas from master

…/static-lambdas

…c-lambdas

Merge master to features/static-lambdas

…c-lambdas

Merge master to features/static-lambdas

…features/static-lambdas

…c-lambdas

Merge master to features/static-lambdas

…c-lambdas

Merge master to features/static-lambdas

…c-lambdas

Merge master to features/static-lambdas

…c-lambdas

Merge master to features/static-lambdas

…features/static-lambdas

… for Casts in SimpleArguments

…ritten.

…pan for test.

…Arguments.

…c-lambdas

Merge master to features/static-lambdas

Before rewriting the statement, it now checks to see if the Switch expression is being implicitly converted. If so, it explicitly casts the expression to mach the label constant and then rewrites. If not, it rewrites as before.

This will now explicitly cast the switch expression to its converted type every time. If the cast is not needed then the Simplifier will remove the cast.

The cast is now made in the ConvertSwitchStatementToExpressionCodeFixProvider.Rewriter.cs rather than ConvertSwitchStatementToExpressionCodeFixProvider.cs

…c-lambdas

Merge master to features/static-lambdas

Now the ConvertSwitchStatementToExpressionCodeFixProvider.Rewriter.cs applies an explicit cast when it is applicable

1. Avoid creating and querying dictionaries from analyzers to actions. Instead maintain a tuple of (analyzer, actions) and special case IDE partial analysis scope to skip analyzers not in analysis scope.
2. Cache grouped analyzer actions for per-symbol actions registered within SymbolStart actions instead of re-computing them for every member symbol.

Benchmark: https://github.com/dotnet/roslyn/blob/master/docs/wiki/Measuring-Compiler-Performance.md

Default benchmark:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 14.79 s | 0.147 s | 0.304 s | 14.87 s | 14.17 s | 15.45 s | 218000.0000 | 64000.0000 | 3000.0000 |   1.28 GB |

Default benchmark + one SymbolStart analyzer:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 16.96 s | 0.079 s | 0.088 s | 16.95 s | 16.85 s | 17.14 s | 225000.0000 | 66000.0000 | 2000.0000 |   1.32 GB |

Default benchmark:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 12.76 s | 0.077 s | 0.085 s | 12.75 s | 12.62 s | 12.92 s | 218000.0000 | 60000.0000 | 2000.0000 |   1.28 GB |

Default benchmark + one SymbolStart analyzer:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 14.87 s | 0.121 s | 0.101 s | 14.90 s | 14.72 s | 15.08 s | 220000.0000 | 65000.0000 | 2000.0000 |   1.29 GB |

1. **Microsoft.CodeAnalysis.CSharp.csproj**: `msbuild /v:m /m /t:rebuild /p:UseRoslynAnalyzers=true`: Improvement from _~60 seconds_ to _~51 seconds_
2. **RoslynAnalyzers.sln**:  Improvement from _~55 seconds_ to _~48 seconds_
AnalyzerDriver performance improvements

1. Avoid creating and querying dictionaries from analyzers to actions. Instead maintain a tuple of (analyzer, actions) and special case IDE partial analysis scope to skip analyzers not in analysis scope.
2. Cache grouped analyzer actions for per-symbol actions registered within SymbolStart actions instead of re-computing them for every member symbol.

Benchmark: https://github.com/dotnet/roslyn/blob/master/docs/wiki/Measuring-Compiler-Performance.md

Default benchmark:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 14.79 s | 0.147 s | 0.304 s | 14.87 s | 14.17 s | 15.45 s | 218000.0000 | 64000.0000 | 3000.0000 |   1.28 GB |

Default benchmark + one SymbolStart analyzer:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 16.96 s | 0.079 s | 0.088 s | 16.95 s | 16.85 s | 17.14 s | 225000.0000 | 66000.0000 | 2000.0000 |   1.32 GB |

Default benchmark:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 12.76 s | 0.077 s | 0.085 s | 12.75 s | 12.62 s | 12.92 s | 218000.0000 | 60000.0000 | 2000.0000 |   1.28 GB |

Default benchmark + one SymbolStart analyzer:
|                      Method |    Mean |   Error |  StdDev |  Median |     Min |     Max |       Gen 0 |      Gen 1 |     Gen 2 | Allocated |
|---------------------------- |--------:|--------:|--------:|--------:|--------:|--------:|------------:|-----------:|----------:|----------:|
| GetDiagnosticsWithAnalyzers | 14.87 s | 0.121 s | 0.101 s | 14.90 s | 14.72 s | 15.08 s | 220000.0000 | 65000.0000 | 2000.0000 |   1.29 GB |

1. **Microsoft.CodeAnalysis.Workspaces.csproj**: `msbuild /v:m /m /t:rebuild /p:UseRoslynAnalyzers=true`
2. **Compilers.sln**: `msbuild /v:m /m /t:rebuild /p:UseRoslynAnalyzers=true Compilers.sln`

…latest design. (#45831)

Related to #45296.

From specification:
If the record is derived from `object`, the record type includes a synthesized readonly property equivalent to a property declared as follows:
```C#
protected Type EqualityContract { get; };
```
The property is `virtual` unless the record type is `sealed`.
The property can be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or if the explicit declaration doesn't allow overiding it in a derived type and the record type is not `sealed`.

If the record type is derived from a base record type `Base`, the record type includes a synthesized readonly property equivalent to a property declared as follows:
```C#
protected override Type EqualityContract { get; };
```

The property can be declared explicitly. It is an error if the explicit declaration does not match the expected signature or accessibility, or if the explicit declaration doesn't allow overiding it in a derived type and the record type is not `sealed`. It is an error if either synthesized, or explicitly declared property doesn't override a property with this signature in the record type `Base` (for example, if the property is missing in the `Base`, or sealed, or not virtual, etc.).
The synthesized property returns `typeof(R)` where `R` is the record type.

Remove trailing commas during conversion to class

RemotableDataService refactoring

…re either test or product bugs

…roviderSemantic

Skip flaky test

[Dogfooding] Extend existing IDE code style enforcement rules to EditorFeatures layer

Fix VB case correction for named tuple identifiers

* Use TestHost consistently

* Comments

* Fix

* RenameTestHost

* Renaming

Remove experimental feed