mutable decl syntax change

testbed/mem_alloc/std/mem/mem.bro

@@ -27,7 +27,7 @@ raw_free func(allocator Allocator, memory ?*mut u8, size usize, alignment usize)
 	allocator.vtable.free(allocator.context, memory, size, alignment)
 }
 
-hide empty_storage [1]mut u64 = [0]
+hide empty_storage [1]mut u64 := [0]
 
 hide empty_slice func($T type, count usize) []mut T {
 	pointer *mut T :: ptrcast!(T, (&empty_storage).ptr)
@@ -47,7 +47,7 @@ alloc func($T type, allocator Allocator, count usize) []mut T ! AllocError {
 		return .out_of_memory
 	}
 
-	memory ?*mut u8 = raw_alloc(allocator, count * element_size, alignof!(T))
+	memory ?*mut u8 := raw_alloc(allocator, count * element_size, alignof!(T))
 	if memory |bytes| {
 		pointer *mut T :: ptrcast!(T, bytes)
 		return pointer[..count]
@@ -68,9 +68,9 @@ hide power_of_two func(value usize) bool {
 		return false
 	}
 
-	current usize = value
+	current usize := value
 	while current > 1 {
-		half usize = current / 2
+		half usize := current / 2
 		if half * 2 != current {
 			return false
 		}
@@ -89,8 +89,8 @@ hide c_alloc func(_ ?*mut anyopaque, size usize, alignment usize) ?*mut u8 {
 		return ptrcast!(u8, c.malloc(c_ulong(size)))
 	}
 
-	memory [1]mut ?*mut anyopaque = [null]
-	status c_int = c.posix_memalign((&memory).ptr, c_ulong(alignment), c_ulong(size))
+	memory [1]mut ?*mut anyopaque := [null]
+	status c_int := c.posix_memalign((&memory).ptr, c_ulong(alignment), c_ulong(size))
 	if status != 0 {
 		return null
 	}
@@ -113,13 +113,13 @@ hide c_realloc func(_ ?*mut anyopaque, memory ?*mut u8, old_size usize, new_size
 			return ptrcast!(u8, c.realloc(old_memory, c_ulong(new_size)))
 		}
 
-		new_memory ?*mut u8 = c_alloc(null, new_size, alignment)
+		new_memory ?*mut u8 := c_alloc(null, new_size, alignment)
 		if new_memory |new_bytes| {
-			copy_size usize = old_size
+			copy_size usize := old_size
 			if new_size < copy_size {
 				copy_size = new_size
 			}
-			i usize = 0
+			i usize := 0
 			while i < copy_size : i += 1 {
 				new_bytes[i] = old_memory[i]
 			}