mutable decl syntax change

examples/programs/tuples/main.bro

@@ -9,7 +9,7 @@ format func() []u8 {
 }
 
 sum func($T type, value T) i32 {
-	total i32 = 0
+	total i32 := 0
 	match typeinfo!(T) {
 		.record |record|: inline for record.fields |field| {
 			total += i32(field!(value, field.name))
@@ -20,7 +20,7 @@ sum func($T type, value T) i32 {
 }
 
 static_control func($T type, value T) i32 {
-	total i32 = 0
+	total i32 := 0
 	match typeinfo!(T) {
 		.record |record|: inline for record.fields |field| {
 			{
@@ -49,7 +49,7 @@ row_value func(row Row) i32 {
 }
 
 static_aggregates func() i32 {
-	total i32 = 0
+	total i32 := 0
 	inline for {Row {value = 2}, Row {value = 40}} |row| {
 		total += row_value(row)
 	}
@@ -57,7 +57,7 @@ static_aggregates func() i32 {
 }
 
 main func() i32 {
-	numbers Numbers = Numbers {1, 2, 39}
+	numbers Numbers := Numbers {1, 2, 39}
 	singleton :: {42,}
 	empty :: {}
 	block_value :: {