Error Union

Definitions

1. A Zig language type that combines a normal return type with a set of possible error values, forcing callers to handle errors explicitly. Written as !T or ErrorSet!T.

   In plain English: A return type in Zig that says 'this gives you either the result you want OR an error' — and the compiler won't let you ignore the error.

   Example: "The function returns FileOpenError!File — you must handle the error before you can use the file handle."

Related Terms

• Algebraic Data Type
• Class
• Comptime
• Derived Type
• Discriminant
• Discriminated Union
• Dynamic Typing
• No Hidden Control Flow
• Recover
• Result Type
• Sentinel Value
• Unwrap