Function register 

pub fn register<R: Rt, E: UserEvent>(
    ctx: &mut ExecCtx<R, E>,
    modules: BitFlags<Module>,
) -> Result<(ArcStr, ModuleResolver)>

Register selected modules of the standard graphix library

and return a root module that will load them along with a module resolver that contains the necessary code. You need both of these for the rt module.

Note, core is always included and registered, all the other modules are optional

Example

use netidx::{publisher::Publisher, subscriber::Subscriber};
use anyhow::Result;
use poolshark::global::GPooled;
use graphix_compiler::ExecCtx;
use graphix_rt::{GXRt, GXConfigBuilder, GXHandle, GXEvent, NoExt};
use tokio::sync::mpsc;
use enumflags2::BitFlags;

async fn start_runtime(
    publisher: Publisher,
    subscriber: Subscriber,
    sub: mpsc::Sender<GPooled<Vec<GXEvent>>>
) -> Result<GXHandle<NoExt>> {
    let mut ctx = ExecCtx::new(GXRt::<NoExt>::new(publisher, subscriber))?;
    let (root, mods) = graphix_stdlib::register(&mut ctx, BitFlags::all())?;
    GXConfigBuilder::default()
       .ctx(ctx)
       .root(root)
       .resolvers(vec![mods])
       .sub(sub)
       .build()?
       .start()
       .await
}