diff --git a/ablescript/src/error.rs b/ablescript/src/error.rs
index d78aa25..051a325 100644
--- a/ablescript/src/error.rs
+++ b/ablescript/src/error.rs
@@ -14,7 +14,6 @@ pub enum ErrorKind {
     UnknownVariable(String),
     MeloVariable(String),
     TopLevelBreak,
-    MismatchedArity,
     MissingLhs,
     Brian(InterpretError),
     Io(io::Error),
@@ -54,7 +53,6 @@ impl Display for ErrorKind {
             ErrorKind::TopLevelBreak => write!(f, "can only `break` out of a loop"),
             ErrorKind::Brian(err) => write!(f, "brainfuck error: {}", err),
             // TODO: give concrete numbers here.
-            ErrorKind::MismatchedArity => write!(f, "wrong number of function arguments"),
             ErrorKind::MissingLhs => write!(f, "missing expression before binary operation"),
             ErrorKind::Io(err) => write!(f, "I/O error: {}", err),
         }
diff --git a/ablescript/src/interpret.rs b/ablescript/src/interpret.rs
index 7cdd7a4..5b0ff37 100644
--- a/ablescript/src/interpret.rs
+++ b/ablescript/src/interpret.rs
@@ -437,13 +437,6 @@ impl ExecEnv {
                     .expect("Failed to write to stdout");
             }
             Functio::Able { params, body } => {
-                if params.len() != args.len() {
-                    return Err(Error {
-                        kind: ErrorKind::MismatchedArity,
-                        span: span.to_owned(),
-                    });
-                }
-
                 self.stack.push(Default::default());
 
                 for (param, arg) in params.iter().zip(args.iter()) {
@@ -474,17 +467,7 @@ impl ExecEnv {
                     }
                 };
             }
-            Functio::Eval(code) => {
-                if !args.is_empty() {
-                    return Err(Error {
-                        kind: ErrorKind::MismatchedArity,
-                        span: span.to_owned(),
-                    });
-                }
-
-                let stmts = crate::parser::parse(&code)?;
-                self.eval_stmts(&stmts)?;
-            }
+            Functio::Eval(code) => self.eval_stmts(&crate::parser::parse(&code)?)?,
         }
         Ok(())
     }