Fix issue that prevented us from offering rename-file options.
Fixes #16284

Add support for generating methods that return-by-ref.
Fixes #16398

Pass along the value that was unexpected when we encounter one.

Report use-site diagnostics if System.ValueTuple base type is an error type

Properly generate type syntax for tuples with less than arity-2.
Fixes #16793

Guard against serialization failure of Encoding

* remove superfluous use of local function

* add preliminary stack depth finder

* vs changed files

* Use shorter version number for s.c.immutable

Allow emitting debugging symbols via high level scripting APIs

Treat hidden code (#line hidden) as generated code for analyzers

Fix generation of events in interfaces.
Fixes #16964 

Enable 'Add ValueTuple Package' for VB.
Fixes #16650

Preserve existing trivia better when converting from a block to an expression-body
Fixes #16386

Harden compilers against misplaced global code plus some clean-up around ScriptClass.

Fix IInlineRenameInfo.GetFinalSymbolName not being respected

improve tests by using StackTrace API and diagnostic verifier