[fine] Missed a test :O

fine/tests/expression/variable.fine

@@ -0,0 +1,23 @@
+// @concrete:
+// | File
+// |   LetStatement
+// |     Let:'"let"'
+// |     Identifier:'"x"'
+// |     Equal:'"="'
+// |     LiteralExpression
+// |       Number:'"23"'
+// |     Semicolon:'";"'
+// |   ExpressionStatement
+// |     BinaryExpression
+// |       Identifier
+// |         Identifier:'"x"'
+// |       Star:'"*"'
+// |       LiteralExpression
+// |         Number:'"2"'
+// |     Semicolon:'";"'
+// |
+
+let x = 23;
+x * 2;
+
+// @type: 416 f64