mutable decl syntax change

examples/programs/defer/main.bro

@@ -7,7 +7,7 @@
 # The return value is captured before defers run, so the mutation here does not
 # change what is returned (Zig semantics).
 spill_check func() i32 {
-	x i32 = 5
+	x i32 := 5
 	defer x = 999
 	return x
 }
@@ -15,7 +15,7 @@ spill_check func() i32 {
 # A function-scope defer runs only at function exit; a `break` runs the loop-body
 # defer but NOT the enclosing function-scope defer.
 enclosing_defer_check func() i32 {
-	v i32 = 0
+	v i32 := 0
 	defer v = v + 100
 	for 0..3 |i| {
 		defer v = v + 1
@@ -89,7 +89,7 @@ main func() i32 {
 	if (spill_check() != 5) return 101
 
 	# 2. LIFO ordering, run at end of each loop iteration.
-	r i32 = 0
+	r i32 := 0
 	for 0..1 |i| {
 		defer r = r * 2 + 1 # registered first -> runs last
 		defer r = r * 2     # registered second -> runs first
@@ -99,16 +99,16 @@ main func() i32 {
 
 	# 3. scoped bare block + scoped defer (defer fires at the closing brace, and
 	#    the block-local is not visible afterwards).
-	a i32 = 1
+	a i32 := 1
 	{
 		defer a = 4
-		c i32 = 3
+		c i32 := 3
 		_ = c
 	}
 	if (a != 4) return 103
 
 	# 4. `defer { ... }` block: all its statements run (in order) at scope close.
-	s i32 = 0
+	s i32 := 0
 	{
 		defer {
 			s = s + 1
@@ -119,7 +119,7 @@ main func() i32 {
 	if (s != 60) return 104 # 5 -> 6 -> 60
 
 	# 5. `break` flushes the loop-body defer.
-	bc i32 = 0
+	bc i32 := 0
 	for 0..5 |i| {
 		defer bc = bc + 1
 		if (i == 2) break
@@ -127,7 +127,7 @@ main func() i32 {
 	if (bc != 3) return 105 # i=0,1 fall-through + i=2 break
 
 	# 6. `continue` flushes the loop-body defer.
-	cc i32 = 0
+	cc i32 := 0
 	for 0..3 |i| {
 		defer cc = cc + 1
 		if (i == 1) continue
@@ -139,7 +139,7 @@ main func() i32 {
 	if (enclosing_defer_check() != 2) return 107
 
 	# 8. errdefer is skipped on success; ordinary defers stay interleaved.
-	trace i32 = 0
+	trace i32 := 0
 	if ((explicit_cleanup(false, &trace) catch 0) != 7 or trace != 31) return 108
 
 	# 9. Explicit errors run errdefer and expose the captured error.