Bug or optimisation

The following code:

struct A:
    fn __init__(inout self): ...
    
fn main(): 
    print(UnsafePointer.address_of(A()) == UnsafePointer.address_of(A())) # Prints True

struct A:
    fn __init__(inout self): ...
    
fn main(): 
    print(UnsafePointer.address_of(A()) == UnsafePointer.address_of(A())) # Prints True

struct A:
    fn __init__(inout self): ...
    
fn main(): 
    print(UnsafePointer.address_of(A()) == UnsafePointer.address_of(A())) # Prints True

struct A:
    fn __init__(inout self): ...
    
fn main(): 
    print(UnsafePointer.address_of(A()) == UnsafePointer.address_of(A())) # Prints True

indicates that both initialised empty struct has the same address. Are empty structs automatically "singleton"? Or is it a bug in the compiler? I am using Mac M1.

Bug or optimisation

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