From d8eef9c95b2716fc884d3984bc102d7df020172b Mon Sep 17 00:00:00 2001
From: Aidan Hahn <aidanhahn@datawire.io>
Date: Tue, 2 Nov 2021 19:18:11 -0700
Subject: [PATCH] fix function calls with no argument

---
 src/eval.rs | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/eval.rs b/src/eval.rs
index 0686b62..42a3637 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -46,14 +46,22 @@ pub fn eval(
 
     // another check to detect if we may have a function call
     if let Ctr::Symbol(ref tok) = car {
-        if let Ctr::Seg(ast) = cdr {
-            if let Some(func) = funcs.borrow().get(tok) {
-                return func_call(func.clone(), ast.clone(), vars.clone(), funcs.clone())
-            } else {
-                return Err(format!("Couldnt find function: {}.", tok))
-            }
-        } else {
-            return Err(format!("Arguments to function not a list!"))
+        match cdr {
+            Ctr::Seg(ast) => {
+                if let Some(func) = funcs.borrow().get(tok) {
+                    return func_call(func.clone(), ast.clone(), vars.clone(), funcs.clone())
+                } else {
+                    return Err(format!("Couldnt find function: {}.", tok))
+                }
+            },
+            Ctr::None => {
+                if let Some(func) = funcs.borrow().get(tok) {
+                    return func_call(func.clone(), new_ast(Ctr::None, Ctr::None), vars.clone(), funcs.clone())
+                } else {
+                    return Err(format!("Couldnt find function: {}.", tok))
+                }
+            },
+            _ => return Err(format!("Arguments to function not a list!"))
         }
     }