A strange charArray.ptr behavior

[Ferhat Kurtulmuş via Digitalmars-d-learn]

given the function:

export void ceaser_enc(char* input, ref char* output);
this compiles:
    char* sezar = (new char[65]).ptr;
    ceaser_enc(key, sezar);

this does not compile:

    char[] sezar = new char[65];
    ceaser_enc(key, sezar.ptr);

by yielding: "cannot pass rvalue argument cast(char*)sezar of 
type char* to parameter ref char* output"

Why is sezar an rvalue in the second case?