fix: missing implicit operator

(0.2)20^2 was missing a mult and caused a crash,
even though (0.2)20 was just fine.

src/nodes/parse.rs

@@ -129,9 +129,7 @@ impl FromStr for Nodes {
                         && !(c == 'e' && filtered_string.chars().nth(i + 1).is_some_and(|c| c == '-'))
                         && !(c == '-' && filtered_string.chars().nth(i - 1).is_some_and(|c| c == 'e'))
                     {
-                        // likely a constant before this number
-                        // no need to check for parenthesis here though (why?)
-                        if matches!(nodes.last(), Some(Node::Number(_))) {
+                        if matches!(nodes.last(), Some(Node::ParenthesisEnd | Node::Number(_))) {
                             nodes.push(Node::Operator(Default::default()));
                         }
 

src/nodes/tests.rs

@@ -56,3 +56,10 @@ fn constant_implicit_mult() {
 fn pi_precision() {
     assert_eq!(eval("sin(pi)"), 0.)
 }
+
+#[test]
+fn operator_after_parenthesis() {
+    assert_eq!(eval("(0.2)20"), 4.);
+    assert_eq!(eval("(0.2)20^2"), 80.);
+    assert_eq!(eval("(0.2)20^2/2 - (0.2)10^2/2"), 30.);
+}