Foreword

This specification replaces ECMA-334:2026. Changes from the previous edition include the addition of the following features:

• record class as an alias for record
• record structs
• Record types can seal ToString
• Enhanced #line directives
• CallerArgumentExpression attribute for diagnostics
• Interpolated string handler
• Constant interpolated strings
• File Scoped Namespaces
• Allow AsyncMethodBuilder attribute on methods
• Assignment and declaration in the same deconstruction
• Improved definite assignment
• Lambda expression improvements
• Extended property patterns
• Global using directives
• Improvements to structure types