pub unsupported for Rust tuple struct in Getable derive macro

[tyler-conrad]

The macro for Getable derive doesn't seem to support the pub keyword. I've modified this example:
https://github.com/gluon-lang/gluon/blob/master/codegen/tests/full.rs
to highlight the issue. Note the struct Newtype(pub Struct); line.

extern crate gluon;
#[macro_use]
extern crate gluon_codegen;
#[macro_use]
extern crate gluon_vm;

use gluon::{
    new_vm,
    Thread,
    Compiler,
    vm::{
        self,
        ExternModule,
    },
    import,
};

#[derive(Debug, PartialEq, Getable, Pushable, VmType)]
struct Struct {
    string: String,
    number: u32,
    vec: Vec<f64>,
}

fn load_struct_mod(vm: &Thread) -> vm::Result<ExternModule> {
    let module = record! {
        new_struct => primitive!(1, new_struct),
    };

    ExternModule::new(vm, module)
}

fn new_struct(_: ()) -> Struct {
    Struct {
        string: "hello".to_owned(),
        number: 1,
        vec: vec![1.0, 2.0, 3.0],
    }
}

#[test]
fn normal_struct() {
    let vm = new_vm();
    let mut compiler = Compiler::new();
    import::add_extern_module(&vm, "functions", load_struct_mod);

    let script = r#"
        let { new_struct } = import! functions

        new_struct ()
    "#;

    let (s, _) = compiler
        .run_expr::<Struct>(&vm, "test", script)
        .unwrap_or_else(|why| panic!("{}", why));

    assert_eq!(
        s,
        Struct {
            string: "hello".into(),
            number: 1,
            vec: vec![1.0, 2.0, 3.0],
        }
    );
}

#[derive(Debug, PartialEq, VmType, Pushable, Getable)]
struct Newtype(pub Struct);

fn load_newtype_mod(vm: &Thread) -> vm::Result<ExternModule> {
    let module = record! {
        newtype_id => primitive!(1, newtype_id),
    };

    ExternModule::new(vm, module)
}

fn newtype_id(val: Newtype) -> Newtype {
    val
}

#[test]
fn newtype() {
    let vm = new_vm();
    let mut compiler = Compiler::new();
    import::add_extern_module(&vm, "functions", load_newtype_mod);

    // newtypes should map to the inner type
    let script = r#"
        let { newtype_id } = import! functions
        newtype_id { string = "test", number = 42, vec = [1.0, 1.0, 2.0, 3.0, 5.0] }
    "#;

    let (s, _) = compiler
        .run_expr::<Newtype>(&vm, "test", script)
        .unwrap_or_else(|why| panic!("{}", why));

    assert_eq!(
        s,
        Newtype(Struct {
            string: "test".into(),
            number: 42,
            vec: vec![1.0, 1.0, 2.0, 3.0, 5.0],
        })
    );
}

This is the error I get:

error: expected type, found keyword `pub`
  --> src/main.rs:68:16
   |
68 | struct Newtype(pub Struct);
   |                ^^^

error: proc-macro derive produced unparseable tokens
  --> src/main.rs:67:46
   |
67 | #[derive(Debug, PartialEq, VmType, Pushable, Getable)]
   |                                              ^^^^^^^

error: aborting due to 2 previous errors

[Marwes]

Thanks! Fixed with #714