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E0011: Unknown Type Annotation

You used a type name that hasn't been defined.

Example​

fn process(x: Foo) {  // Error: unknown type annotation `Foo`
    // ...
}

How to fix​

Define the type before using it:

struct Foo {
    value: i64,
}

fn process(x: Foo) {  // OK
    // ...
}

Or check for typos in the type name:

fn process(x: i64) {  // OK: using a built-in type
    // ...
}