Add symbol collection visitor

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/main.rs

@@ -44,13 +44,16 @@ fn main() -> Result<()> {
     //println!("{:#?}", ast);
     
     let mut ctx = compile::ctx::Ctx::new();
+    compile::name::CollectSyms::new(&mut ctx, text.as_str()).collect(&ast);
+    println!("{:#?}", ctx.syms());
+
     ctx.name_stack_mut().push_default();
     {
         let mut collect_names = compile::name::CollectNames::new(&mut ctx, text.as_str());
         collect_names.collect(&ast);
     }
     let names = ctx.name_stack_mut().pop().unwrap();
-    println!("{:#?}", names);
+    //println!("{:#?}", names);
     
     Ok(())
 }