Add function pointer short-hand.

tests/call_fn.rs

@@ -186,7 +186,7 @@ fn test_fn_ptr_raw() -> Result<(), Box<EvalAltResult>> {
                 fn foo(x) { this += x; }
 
                 let x = 41;
-                x.bar(Fn("foo"), 1);
+                x.bar(foo, 1);
                 x
             "#
         )?,

tests/fn_ptr.rs

@@ -77,6 +77,20 @@ fn test_fn_ptr() -> Result<(), Box<EvalAltResult>> {
             if fn_name == "foo" && matches!(*err, EvalAltResult::ErrorUnboundThis(..))
     ));
 
+    #[cfg(not(feature = "no_function"))]
+    assert_eq!(
+        engine.eval::<INT>(
+            r#"
+                fn foo(x) { x + 1 }
+                let f = foo;
+                let g = 42;
+                g = foo;
+                call(f, 39) + call(g, 1)
+            "#
+        )?,
+        42
+    );
+
     Ok(())
 }
 

tests/options.rs

@@ -104,6 +104,11 @@ fn test_options_strict_var() -> Result<(), Box<EvalAltResult>> {
 
     #[cfg(not(feature = "no_function"))]
     {
+        assert_eq!(
+            engine
+                .eval_with_scope::<INT>(&mut scope, "fn foo(z) { y + z } let f = foo; f.call(x)")?,
+            42
+        );
         assert!(engine.compile("let f = |y| x * y;").is_err());
         #[cfg(not(feature = "no_closure"))]
         {