mutable decl syntax change

examples/programs/while_loop/main.bro

@@ -1,31 +1,31 @@
 # Milestone 5: boolean while loops with optional post-iteration updates.
 
 return_before_update func() i32 {
-	i i32 = 0
+	i i32 := 0
 	while true : i = i + 1 {
 		return i
 	}
 }
 
 main func() i32 {
-	total i32 = 0
+	total i32 := 0
 
 	# ordinary condition and update
-	i u32 = 0
+	i u32 := 0
 	while i < 5 : i = i + 1 {
 		total = total + 2
 	}
 
 	# equivalent parenthesized header
-	j u32 = 0
+	j u32 := 0
 	while (j < 4) : (j = j + 1) {
 		total = total + 3
 	}
 
 	# nested loops and body-local storage
-	outer u32 = 0
+	outer u32 := 0
 	while outer < 2 : outer = outer + 1 {
-		inner u32 = 0
+		inner u32 := 0
 		while inner < 3 : inner = inner + 1 {
 			total = total + 2
 		}
@@ -33,9 +33,9 @@ main func() i32 {
 
 	# Body-local storage stays scoped to the body. The update still targets
 	# the mutable k declared before the loop.
-	k u32 = 0
+	k u32 := 0
 	while k < 4 : k = k + 1 {
-		body_k u32 = 100
+		body_k u32 := 100
 		if body_k == 100 {
 			total = total + 2
 		}