parser: match expression + match fixes

compiler/tests/match_test.v

@@ -1,12 +1,88 @@
-fn test_match() {
-	a := 3 
-	mut b := 0 
-	match a {
-	   2 => println('two') 
-	   3 => println('three') 
-	        b = 3 
-	   4 => println('four') 
-	else => println('???') 
-	} 
-	assert b == 3 
+enum Color{
+    red, green, blue
+}
+
+fn test_match_integers() {
+	// a := 3 
+	// mut b := 0 
+	// match a {
+	//    2 => println('two') 
+	//    3 => println('three') 
+	//         b = 3 
+	//    4 => println('four') 
+	// else => println('???') 
+	// } 
+	// assert b == 3 
+
+    assert match 2 {
+        1 => {2}
+        2 => {3}
+        else => {5}
+    } == 3
+    
+    assert match 0 {
+        1 => {2}
+        2 => {3}
+        else => 5
+    } == 5
+
+    assert match 1 {
+        else => {5}
+    } == 5
+    
+    mut a := 0
+    match 2 {
+        0 => {a = 1}
+        1 => {a = 2}
+        else => {
+            a = 3
+            println('a is $a')
+        }
+    }
+    assert a == 3
+    
+    a = 0
+    match 1 {
+        0 => {a = 1}
+        1 => {
+            a = 2
+            a = a + 2
+            a = a + 2
+        }
+    }
+    assert a == 6
+
+    a = 0
+    match 1 {
+        else => {
+            a = -2
+        }
+    }
+    assert a == -2
 } 
+
+fn test_match_enums(){
+    mut b := Color.red
+    match b{
+        .red => {
+            b = .green
+        }
+        .green => {b = .blue}
+        else => {
+            println('b is ${b.str()}')
+            b = .red
+        }
+    }
+    assert b == .green
+
+    match b{
+        .red => {
+            b = .green
+        }
+        else => {
+            println('b is ${b.str()}')
+            b = .blue
+        }
+    }
+    assert b == .blue
+}