Function Perl_newCONSTSUB 

pub unsafe fn Perl_newCONSTSUB(
    my_perl: *mut PerlInterpreter,
    stash: *mut HV,
    name: *const c_char,
    sv: *mut SV,
) -> *mut CV

thx shim for crate::Perl_newCONSTSUB.