Add a lot of new stuff to the compile mod

* compile::sym is now compile::name
* add basic block structure
* add visitor pattern
* some other minor things (e.g. syn::ast::prelude)

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

src/main.rs

@@ -40,6 +40,17 @@ fn main() -> Result<()> {
     let opt = Options::from_args();
     let text = fs::read_to_string(&opt.input)?;
     let mut parser = Parser::try_from(text.as_str())?;
-    println!("{:#?}", parser.next_body()?);
+    let ast = parser.next_body()?;
+    //println!("{:#?}", ast);
+    
+    let mut ctx = compile::Ctx::new(text.as_str());
+    ctx.name_stack_mut().push_default();
+    {
+        let mut collect_names = compile::name::CollectNames::new(&mut ctx);
+        collect_names.collect(&ast);
+    }
+    let names = ctx.name_stack_mut().pop().unwrap();
+    println!("{:#?}", names);
+    
     Ok(())
 }