box explainer

box.zig

@@ -14,21 +14,23 @@ const Point = struct {
 
 pub fn main() !void {
     var vbox = Box(Point){
-        .value = undefined,
+        .value = undefined, // this is gonna be junk
     };
     try stdout.print("var box with undefined: {}\n", vbox);
 
     var vbox2 = Box(Point){
-        .value = Point{},
+        .value = Point{}, // this is the default value
     };
     try stdout.print("var box with explicit defaults: {}\n", vbox2);
 
+    // looks like the value of this winds up in bss.
+    // https://en.wikipedia.org/wiki/.bss
     const cbox = Box(Point){
-        .value = undefined,
+        .value = undefined, // this is zeroed out memory
     };
     try stdout.print("const box with undefined: {}\n", cbox);
 
     try stdout.print("Box literal with undefined: {}\n", Box(Point){
-        .value = undefined,
+        .value = undefined, // this is also zeroed out memory
     });
 }