fix a bug in sided reach

Author: kaikalii

src/compile/modifier.rs

@@ -502,11 +502,11 @@ impl Compiler {
                             node = Node::Mod(Dip, eco_vec![SigNode::new(sn.sig, node)], span);
                             node.prepend(Node::Prim(Flip, span));
                         }
-                        SubSide::Right => node.prepend(Node::Mod(
-                            Dip,
-                            eco_vec![SigNode::new((2, 2), Node::Prim(Flip, span))],
-                            span,
-                        )),
+                        SubSide::Right => {
+                            node.prepend(Node::Prim(Pop, span));
+                            node = Node::Mod(Off, eco_vec![node.sig_node().unwrap()], span);
+                            node.prepend(Node::Prim(Flip, span));
+                        }
                     }
                 } else {
                     node.prepend(Node::Mod(

tests/units.ua

@@ -542,6 +542,11 @@ path(
 ⍤⤙≍ [1 2 3 6] [◠(++)] 1 2 3
 ⍤⤙≍ [1 2 ¯1 2] [◠(¯⊙∘)] 1 2
 
+# Reach
+⍤⤙≍ 4 𝄐+ 1 2 3
+⍤⤙≍ {@b "acd"} {𝄐⌞⊟₃} @a@b@c@d
+⍤⤙≍ {"acd" @b} {𝄐⌟⊟₃} @a@b@c@d
+
 # Derivative
 ⍤⤙≍ 10 ∂(×.) 5
 ⍤⤙≍ 1.5 ∂√ 1/9