Base compilation of some kind of file to a list of instructions seems to work(!)

I'm able to compile some basic expressions into instructions using the
`not` binary. Big first step, now we need to introduce branches and
loops to the syntax.

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

src/syn/ast.rs

@@ -2,10 +2,7 @@ use crate::syn::visit::*;
 
 // TODO : add locations to parsed items
 
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct Body {
-    pub body: Vec<Stmt>,
-}
+pub type Body = Vec<Stmt>;
 
 //
 // impl Accept for Body
@@ -18,8 +15,7 @@ impl<V: Visit> Accept<V> for Body {
 
 impl<V: Visit<Out=()>> DefaultAccept<V> for Body {
     fn default_accept(&self, visitor: &mut V) -> V::Out {
-        self.body
-            .iter()
+        self.iter()
             .for_each(|stmt| visitor.visit_stmt(stmt));
     }
 }