More expression implementations.

examples/expression_test.fun

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+#!/usr/bin/env fun
+
+// Feature test for current Fun parser/VM.
+
+print("=== Feature Test Start ===")
+
+// Typed declarations
+number a = 2
+number b = 3
+number n = 10
+string s = "Hello, world!"
+boolean flag = true
+
+// Arithmetic and precedence
+number sum = a + b * 5 - 1
+print(sum)           // expect 2 + 3 * 5 - 1 = 16
+
+// Unary operators
+number neg = -n
+print(neg)           // expect -10
+
+number modv = n % 3
+print(modv)          // expect 1
+
+// Booleans and logical ops
+print(!false)        // expect 1 (true)
+print(true && false) // expect 0 (false)
+print(true || false) // expect 1 (true)
+
+// Comparisons and strings
+print(n > 5)         // expect 1
+print(s != "")       // expect 1
+
+// Indentation-based nested if blocks (two spaces)
+if (n >= 10)
+  print(n)           // expect 10
+  if (a + b == 5)
+    print(42)        // expect 42
+
+print("=== Feature Test End ===")