zig/doc/langref/testing_error_with_if.zig

const print = @import("std").debug.print;

pub fn main() void {
    const result = getNumberOrFail();

    if (result) |number| {
        print("got number: {}\n", .{number});
    } else |err| {
        print("got error: {s}\n", .{@errorName(err)});
    }
}

fn getNumberOrFail() !i32 {
    return error.UnableToReturnNumber;
}

// exe=succeed