Rust by Example

// Note: Storage is allocated for generic type `A`, but not for `B`.

//       Therefore, `B` cannot be used in computations.

fn main() {

// Here, `f32` and `f64` are the hidden parameters.

// PhantomTuple type specified as ``.

let _tuple1: PhantomTuple = PhantomTuple('Q', PhantomData);

// PhantomTuple type specified as ``.

let _tuple2: PhantomTuple = PhantomTuple('Q', PhantomData);

// Type specified as ``.

let _struct1: PhantomStruct = PhantomStruct {

first: 'Q',

phantom: PhantomData,

};

// Type specified as ``.

let _struct2: PhantomStruct = PhantomStruct {

first: 'Q',

phantom: PhantomData,

};

// Compile-time Error! Type mismatch so these cannot be compared:

//println!("_tuple1 == _tuple2 yields: {}",

//          _tuple1 == _tuple2);

// Compile-time Error! Type mismatch so these cannot be compared:

//println!("_struct1 == _struct2 yields: {}",

//          _struct1 == _struct2);

}

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