Labels

• noncopyable struct/enum

  Feature → declarations: Noncopyable value type declarations
• not a bug

  Resolution → not a bug: Reported as a bug but turned out to be expected behavior or programmer error
• numerics

  Area → standard library: Numeric API
• objective-c interop

  Feature: Interoperability with Objective-C
• Observation

  Area → standard library: The `Observation` module under the standard library umbrella
• observers

  Feature → accessors: Stored variable (property) observers (`willSet`, `didSet`)
• off topic

  Resolution: Is beyond the scope of the Swift project (Xcode, proprietary Apple frameworks, etc.)
• opaque parameter types

  Feature → types → opaque types: opaque parameter types
• opaque result types

  Feature → types → opaque types: opaque result types
• opaque types

  Feature → types: opaque types
• OpenBSD

  Platform: OpenBSD
• openSUSE

  Platform: openSUSE
• operators

  Feature: operators
• optimized only

  Flag: An issue whose reproduction requires optimized compilation
• Optional

  Area → standard library: The `Optional` type
• optional binding

  Feature → patterns: optional binding
• optional chaining

  Feature → expressions: optional chaining
• optional protocol requirements

  Feature → protocol: optional protocol requirements
• OptionSet

  Area → standard library: The `OptionSet` protocol
• overload resolution

  Area → compiler → type checker: Overload resolution (ranking)
• overloading

  Feature: Overloading symbol names
• override

  Feature: Overriding in classes
• ownership

  Feature: Ownership modifiers and semantics
• pack expansions

  Feature → expressions: Pack expansion expressions
• pack iteration

  Feature → statements → for-in: Pack iteration
• parameter packs

  Feature → generics: Parameter packs
• parameterized protocols

  Feature → protocol: protocols with primary associated types
• parsable output

  Area → compiler → legacy driver: parsable output
• parser

  Area → compiler: The legacy C++ parser
• ParseStdlibOnly