E0710: Cannot infer pointee type

Explanation

@int_to_ptr converts a u64 address to ptr mut T, but the address alone does not say what T is. Rue therefore takes the pointee type from the context in which the resulting pointer is used.

Likely cause

The pointer result is discarded or assigned to a binding without a pointer type annotation, and no later use constrains the pointer to one concrete pointee type.

Examples

Discard a pointer with no inferred pointee

fn main() {
    checked {
        let address: u64 = 0;
        @int_to_ptr(address);
    }
}

Annotate the pointer result

fn main() {
    checked {
        let address: u64 = 0;
        let pointer: ptr mut u8 = @int_to_ptr(address);
    }
}

References

• Integer-to-pointer result type

• Integer-to-pointer operand and inference