struct field declared type inference

examples/programs/arraylist/main.bro

@@ -12,6 +12,13 @@ State :: struct {
 
 arrlist_test std.ArrayList(Token) = arraylist.init(mem.c_allocator)
 
+init func(allocator mem.Allocator) State {
+	return State {
+		tokens = arraylist.init(allocator),
+		diagnostics = arraylist.init(allocator),
+	}
+}
+
 hide fail_alloc func(_ ?@mut anyopaque, _ usize, _ usize) ?*mut u8 {
 	return none
 }
@@ -34,6 +41,9 @@ hide fail_allocator mem.Allocator :: mem.Allocator {
 }
 
 run func() i32 ! mem.AllocError {
+	state State :: init(mem.c_allocator)
+	_ = state
+
 	values std.ArrayList(i32) = arraylist.init(mem.c_allocator)
 	defer arraylist.deinit(&values)
 	if (values.items.len != 0 or values.capacity != 0) return 1