fix: prevented loading non-let expressions as declarations

2 files changed, 9 insertions, 2 deletions

diff --git a/src/main.rs b/src/main.rs
index 0fcf340..30bd136 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,7 +15,14 @@ fn read_bind_files(
 	let mut contents = String::new();
 	file.read_to_string(&mut contents)
 	    .map_err(|e| e.to_string())?;
-	res.extend(parse_to_ast(&contents)?.parts());
+	let exps = parse_to_ast(&contents)?.parts();
+	for exp in exps {
+	    if exp.clone().check_let().is_some() {
+		res.push(exp);
+	    } else {
+		return Err(format!("'{}' isn't a declaration", exp));
+	    }
+	}
     }
     Ok(res)
 }
diff --git a/stdlib.slip b/stdlib.slip
index 9e20c64..dce325a 100644
--- a/stdlib.slip
+++ b/stdlib.slip
@@ -18,4 +18,4 @@
     (fn x Int Int
         (- x 1)
     )
-)
\ No newline at end of file
+)