anchor.diff:  
   | Suppress emitting localsinit  | 🧩 *SkipLocalsInitAttribute*  | 9.0  | 2020-11-10
   
  -| Target typed new  | _// *new()* doesn't require a type name when inferrable_  | 9.0  | 2020-11-10
  -
  -| Throw expressions
  -| _expr_ ? _expr_ : throw _exception_ 〰️ _x_ ?? throw _exception_ 〰️ _Member_ => throw _exception_
  -| 7.0
  -| 2017-04-05
  -
  -| Top level statements
  -| _// statements in one source file outside any containing method imply program entry point_
  -| 9.0
  -| 2020-11-20
  -
   | Tuples and deconstruction  | (_type_, …) _x_ = (_value_, …); _// or with (_type **PropertyName**_, …)  | 7.0  | 2017-04-05
   
   | Tuples: Inferred element names  | list.Select(x => (x.Id, x.Name)).Where(y => y.Id == 1)  | 7.1  | 2017-08-14
  -
  -| Using declarations  | *using var* _x_ = _disposble_; _// applies to end of scope_  | 8.0  | 2019-09-23
   
   |===
   
  
positive.code: 
  | Lambda expressions: Return type  | var _name_ = *__returntype__* _params_ => _expression_ ;  | 10.0  | 2021-11-08
  
  | Local functions  | _type_ _Name_() { _type_ _OtherName_() { … } … _OtherName_(); }  | 7.0  | 2017-04-05
  
  | Local functions: Attributes  | _// attributes are allowed before local functions_  | 9.0  | 2020-11-10
  
negative.code: 
  | Extension methods  | _Method_(*this* _Type param_)  | 3.0  | 2007-11-19
  
  | Function pointers  | ⌨️ *delegate*  | 9.0  | 2020-11-10
  
  | Generics  | _Type_**<T>** and 🧩 *System.Collections.Generic*  | 2.0  | 2006-01-22
  
  | Global usings  | *global using* _Namespace_ ;  | 10.0  | 2021-11-08
  
  | Indices and ranges  | ❇️ *^* ❇️ *..* 🧩 *System.Index* 🧩 *System.Range*  | 8.0  | 2019-09-23
  
  | Initialization: Anonymous types  | *new { }*  | 3.0  | 2007-11-19
  
  | Initialization: Implicitly typed local variables  | ⌨️ *var*  | 3.0  | 2007-11-19
  
  | Initialization: Initializers  | new Type *{ … }* 〰️ new CollectionType *{ item, item, item, … }*  | 3.0  | 2007-11-19
  
  | Initialization: Target typed new  | _// *new()* doesn't require a type name when inferrable_  | 9.0  | 2020-11-10
  
  | Iterators  | ⌨️ *yield return*  | 2.0  | 2006-01-22
  
  