C# Language Design Notes for 2023

Mon Dec 11, 2023

C# Language Design Meeting for December 11th, 2023

• Extensions

Mon Dec 4, 2023

C# Language Design Meeting for December 4th, 2023

• Lock statement pattern
• BinaryCompatOnlyAttribute

Mon Nov 27, 2023

C# Language Design Meeting for November 27th, 2023

• Pattern order optimizations
• Subarray slicing breaking change
• Making patterns constant expressions

Wed Nov 15, 2023

C# Language Design Meeting for November 15th, 2023

• params improvements
• Nullability analysis of collection expressions
• Evaluation of implicit indexers in object initializers

Mon Oct 16, 2023

C# Language Design Meeting for October 16th, 2023

• Triage
  • Breaking change warnings
  • Determine natural type of method group by looking scope-by-scope
  • u8 string interpolation
  • Lock statement pattern
  • String/Character escape sequence \e as a short-hand for \u001b
  • New operator %% for canonical Modulus operations

Wed Oct 11, 2023

C# Language Design Meeting for October 11th, 2023

• C# spec update
• Collection expressions

Mon Oct 9, 2023

C# Language Design Meeting for October 9th, 2023

• Triage
  • ReadOnlySpan initialization from static data
  • Embedded Language Indicators for raw string literals
  • list-patterns on enumerables
  • Make generated `Program`` for top-level statements public by default
  • CallerCharacterNumberAttribute
  • Add private and namespace accessibility modifiers for top-level types
  • Require await to apply nullable postconditions to task-returning calls
  • is expression evaluating const expression should be considered constant

Wed Oct 4, 2023

C# Language Design Meeting for October 4th, 2023

• Trimming and AOT

Mon Oct 2, 2023

C# Language Design Meeting for October 2nd, 2023

• Collection expressions

Wed Sept 27, 2023

C# Language Design Meeting for September 27th, 2023

• Collection expressions

Mon Sept 25, 2023

C# Language Design Meeting for September 25th, 2023

• Primary constructors
• Defining well-defined behavior for collection expression types

Wed Sept 20, 2023

C# Language Design Meeting for September 20th, 2023

• Collection expressions
  • Type inference from spreads
  • Overload resolution fallbacks

Mon Sept 18, 2023

C# Language Design Meeting for September 18th, 2023

• Collection expression questions
  • Optimizing non-pattern collection construction
  • Avoiding intermediate buffers for known-length cases

Wed Aug 16 2023

C# Language Design Meeting for August 16th, 2023

• Ref-safety scope for collection expressions
• Experimental attribute

Mon Aug 14, 2023

C# Language Design Meeting for August 14th, 2023

• Betterness for collection expressions and span types
• Type inference from collection expression elements
• Collection expression conversions

Wed Aug 9, 2023

C# Language Design Meeting for August 9th, 2023

• Lambdas with explicit return types
• Target typing of collection expressions to core interfaces
• Loosening requirements for collection builder methods

Mon Aug 7, 2023

C# Language Design Meeting for August 7th, 2023

• Improvements to method group natural types

Mon Jul 31, 2023

C# Language Design Meeting for July 31st, 2023

• Primary constructor parameters and readonly

Wed Jul 26, 2023

C# Language Design Meeting for July 26th, 2023

• Primary constructor parameters and readonly

Mon Jul 24, 2023

C# Language Design Meeting for July 24th, 2023

• Method group natural types with extension members
• Interceptors

Mon Jul 17, 2023

C# Language Design Meeting for July 17th, 2023

• Compiler Check-in
• readonly parameters

Wed Jul 12, 2023

C# Language Design Meeting for July 12th, 2023

• Collection Literals
  • Create methods
  • Extension methods
• Interceptors

Mon Jun 19, 2023

C# Language Design Meeting for June 19th, 2023

• Prefer spans over interfaces in overload resolution
• Collection literals

Mon Jun 5, 2023

C# Language Design Meeting for June 5th, 2023

• Collection literals

Wed May 31, 2023

C# Language Design Meeting for May 31st, 2023

• Collection literals

Wed May 17, 2023

C# Language Design Meeting for May 17th, 2023

• Inline arrays

Mon May 15, 2023

C# Language Design Meeting for May 15th, 2023

• Breaking Change Warnings
• Primary Constructors

Mon May 8, 2023

C# Language Design Meeting for May 8th, 2023

• Primary Constructors

Wed May 3, 2023

C# Language Design Meeting for May 3rd, 2023

• Inline Arrays
• Primary constructors
  • Attributes on captured parameters
  • Warning for shadowing base members
• Collection literal natural type

Mon May 1, 2023

C# Language Design Meeting for May 1st, 2023

• Fixed Size Buffers
• lock statement improvements

Wed Apr 26, 2023

C# Language Design Meeting for April 26th, 2023

• Collection literals

Mon Apr 10, 2023

C# Language Design Meeting for April 10th, 2023

• Fixed Size Buffers

Mon Apr 3, 2023

C# Language Design Meeting for April 3rd, 2023

• Collection Literals
• Fixed-size buffers

Wed Mar 15, 2023 (No notes)

• Discriminated Unions
• Interceptors

Mon Mar 13, 2023 (Shorter meeting)

C# Language Design Meeting for March 13th, 2023

• Unsafe in aliases hole
• Attributes on primary ctors

Wed Mar 8, 2023

C# Language Design Meeting for March 8th, 2023

• Discriminated Unions
• Limited Breaking Changes in C#

Wed Mar 1, 2023 (Shorter meeting)

C# Language Design Meeting for March 1st, 2023

• Discriminated Unions Summary

Mon Feb 27, 2023

C# Language Design Meeting for February 27th, 2023

• Interceptors

Wed Feb 22, 2023

C# Language Design Meeting for February 22nd, 2023

• Primary Constructors
• Extensions

Wed Feb 15, 2023

C# Language Design Meeting for February 15th, 2023

• Open questions in primary constructors
  • Capturing parameters in lambdas
  • Assigning to this in a struct

Wed Feb 1, 2023

C# Language Design Meeting for February 1st, 2023

• Position of unsafe in aliases
• Roles and extensions

Wed Jan 18, 2023

C# Language Design Meeting for January 18th, 2023

• Nullable post-conditions and async/await
• Semi-colon bodies for type declarations

Wed Jan 11, 2023

C# Language Design Meeting for January 11th, 2023

• using aliases for any types
  • Pointer types in aliases
  • Reference nullability in aliases
  • Value nullability in aliases

Mon Jan 9, 2023

C# Language Design Meeting for January 9th, 2023

• Working group re-evaluation