Adjust implementation of LookupPosition.IsInMethodDeclaration to consider an expression body even in presence of a block.

Fixed #1702.

Codemodel should return only Namespace when asked for CodeNamespace

Give an error when a type argument is inferred as void, and when a return statement has a void expression.

changed preview warning tagger name from "Warning" to "Preview Warning" to reduce confusion between compiler warning tag.

Fix #1923 AbstractCodeType should return only a namespace when asked for
a CodeNamespace but not a Type

added Preview to Warning tagger to make distinction more clear between preview warning and compiler warning.

changed preview warning tagger name from "Warning" to "Preview Warning" to reduce confusion between compiler warning tag.

Avoid generating an empty sequencePoint element in PdbToXml tool

Updates Concord APIs in Roslyn to add new field "CustomTypeInfo"

Make SourceText's CalculateChecksum method private

Updates Concord APIs in Roslyn to add new field "CustomTypeInfo" which is passed between an managed expression complier and a result provider.
This new field is a new value type "DkmClrCustomTypeInfo", which is used to convey complier specific type information that is not represented by .NET data types (such as C#'s 'dynamic' type).
In Roslyn, this commit also updates the ResultProvider's mock implementation of the Concord API and fixes all affected callsites.

The API Environment.CurrentDirectory is not available on CoreFX.
Switching all uses to Directory.GetCurrentDirectory which is an
equivalent API (it is actually how Environment.CurrentDirectory is often
implemented).

closes #1829

This changes the compiler APIs to no longer use
RuntimeVersion.GetRuntimeDirectory to find the path to mscorlib and
System.dll for the following reasons:

- This API is not available in CoreFx and hence blocks our transition.
- This behavior of implicitly referencing mscorlib doesn't have a
logical equivalent in coreclr where there may be no reachable mscorlib
on the machine (think Linux).

The compiler now takes the SDK search directory as a paramater.  The
consmer will be responsible for feeding down the correct value to the
compiler.

This is the first step in resolving issue #1939

closes #1943

Add MSBuild support for AnalyzerDependency items

Set correct checkmarks in "Set Rule Set Severity"

Set correct path to linked rule set file.

Slimmed down toolset.sln

It now encompasses the actual toolset portion of Roslyn.

Ensure that IOFailure_OpenOutputFile unit-test passes in presence of localized resources.

Fixes #1394.

Propagate Debugger… attributes from async/iterator method to the corresponding state machine MoveNext method.

Propagate Debugger… attributes from async/iterator method to the corresponding state machine MoveNext method.

This addresses issue #807.

PDB verification helper cleanup

added error source support

...

now, error list will have column (which is off by default) that shows source of each errors in a format "assembly name" or "assembly name [vsix name]"

now, error list will have column (which is off by default) that shows source of each errors in a
format "assembly name" for analyzers node. and "assembly name" [vsix name] for vsix

Fix cast simplification within ConditionalAccessExpression.

Handle ConditionalAccessExpressionSyntax expressions within speculation analyzer to ensure that semantics of the conditional access expression and the WhenNotNull part don't change on cast simplication.

Fixes #253

Merge pull request #1914 from shyamnamboodiripad/SimplifierAnnotationForImplementInterfaceThruMember

Add simplifier annotation to cast expressions generated using syntax generator.

This ensures that code fixes such as Implement Interface Through Member never generate casts that user has to simplify in a subsequent manual step.

Fixes #472

Port CA1309 (Use Ordinal StringComparison) to System.Runtime.Analyzers.

Add support for highlighting written references differently than read references.

Add Visible=false metadata to one of the instances of Errors.vb

This prevents it from being listed twice in Solution Explorer.

Fixes #1876.

The fixer for this rule delves into syntax significantly and so cannot be written with just syntaxgenerator. I've refactored the fixer implementation to share some code between the C#\VB fixer.

This prevents it from being listed twice in Solution Explorer.

Fixes #1876.

Handle ConditionalAccessExpressionSyntax expressions within speculation analyzer to ensure that semantics of the conditional access expression and the WhenNotNull part don't change on cast simplication.

Fixes #253

This ensures that code fixes such as Implement Interface Through Member never generate casts that user has to simplify in a subsequent manual step.

Fixes #472

Localization fix for DiagnosticLocalizationTests.TestDiagnosticLocalization: Use the CurrentUICulture as the default culture, not "en-US" culture.

Fixes #1006 

Adding a document describing the semantics of analyzer actions and the c...