* Move more errors out of the parser.

* PR feedback.

* Move to a single diagnostic.

* Add period.

* Update text.

* Update tests.

* Fix test.

Foreach deconstruction should mark iteration variables as assigned.

Run Naming Rules on parameters

Add IVT for MonoDevelop tests

Avoid possible null reference exception

Fix block comments editing when caret on EOF

Update README.md to dev15-rc3

Add ToolTip for OriginalSymbolName

* Make tuple types more round-trippable.

* Add more test info.

* Update test.

* Support roundtripping errors/non-errors.

Update OfficialBuild identifier

Localize the "Severity" header on the Naming Styles page

Fixes:#16106

Add Margin to GroupBoxes in AdvancedOptionPageCSharp

Skip flaky rename tracking test for now

Related to https://github.com/dotnet/roslyn/issues/15225

Fixes internal bug 297517

Fixes #13249

Turn async naming rules off by default

Make the naming styles dialogs properly modal

Remove leading trivia from a type when moving to a new file.

Fixes #16283

Do not offer 'use throw expression' in expression trees.

Fixes #16234

Fix GitMergeBot build

Add ref dialog crash

Updating Locate-VS.ps1 to use the copy in the tools directory, so the native-interop binaries are available at runtime.

Show object creation completion in method calls before assignments. F…