Check statement correctness on compile (#104)

* Check statement correctness on compile

* format

* Update src/frontend/mod.rs

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* clean error handling

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* clean coding style

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* don't need to return ()

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

* Update github workflow for mdbook

* Resolve issue from merge: pass params to check()

---------

Co-authored-by: Ahmad Afuni <root@ahmadafuni.com>

src/middleware/operation.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::fmt;
 
 use anyhow::{anyhow, Result};
 
@@ -265,3 +266,14 @@ impl Operation {
         }
     }
 }
+
+impl fmt::Display for Operation {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        writeln!(f, "middleware::Operation:")?;
+        writeln!(f, "  {:?} ", self.code())?;
+        for (i, arg) in self.args().iter().enumerate() {
+            writeln!(f, "    {}", arg)?;
+        }
+        Ok(())
+    }
+}