malcolmstill

    fn someFunction(a: usize) MyError!usize {
        if (a < 10) return error.LessThanTen;
    
        const b = try anotherFunction(a);
    
        return 2 * b;
    }
    
    fn anotherFunction(x: usize) MyError!usize {
        if (x < 20) return error.LessThanTwenty;
    
        return x * 3;
    }

    const MyError = error {
        LessThanTen,
        LessThanTwenty
    }

    fn parse(allocator: *mem.Allocator, tokens: Tokens, parse_error: *ParseError) !AST

    Zig source files are implicitly structs, with a name equal to the file's basename with the extension truncated. @import returns the struct type corresponding to the file.

    fn someFunction(a: usize) !usize {
        if (a < 10) return error.LessThanTen;
    
        const b = try anotherFunction(a);
    
        return 2 * b;
    }
    
    fn anotherFunction(x: usize) !usize {
        if (x < 20) return error.LessThanTwenty;
    
        return x * 3;
    }

    error {
        LessThanTen,
        LessThanTwenty
    }

    Result<Option<usize>, Error>>

    !?usize

    var it = mem.split(...);
    
    // it.next() returns null after we run out of
    // split text and the while loop exits
    while (it.next()) |substr| {
         // In here we have a non-nil substr
    }