E068: You tried to use a field that doesn't exist on this struct

Every struct in Turf only has the fields you declared for it – nothing more. If you write something.some_field and some_field was never listed in that struct’s { } block, the compiler stops you right here, before your program can run with a value that was never really there.

The most common reason this happens is a simple typo. Here’s a struct with a password field:

struct User {    password: string}mut u: User = User::new("secret");mut pw: string = u.password;   // correct -- reads the real field

If you accidentally typed the field name wrong:

mut pw: string = u.pasword;   // typo!

…Turf will tell you exactly which field it thinks you meant, so you can just fix the spelling and move on.

A couple of other things worth checking if it’s NOT a typo:

• Are you accessing the field on the right variable? It’s easy to mix up two structs that have similarly-named fields.
• Did you mean to call a method instead? u.password and u.password() are different things – one reads a stored value, the other calls a function. If password is meant to be a method, make sure it’s declared as one (with fn User.password(): ...), not as a field.
• If the field really should exist and just hasn’t been added yet, you can add it straight to the struct’s declaration:

struct User {    password: string,    email: string   // new field -- comma-separated, just like this}

Once the field name matches exactly what the struct declares, this error goes away and your code compiles like normal. This is a very normal thing to run into while you’re still learning your way around a struct’s shape – nothing to worry about.

The same code covers a field on something that is not a struct at all: a string, an int, an enum, an array. Those have no fields, so no name is right:

mut s: string = "abc";mut n: int = s.size;          // a string has no fields

If you meant a method, call it with parentheses (s.length()), or use the functions in strings::.

Run turf --explain E068 in a terminal to read this again.