nits for misc 7

code/examples/misc_7.rs

@@ -14,6 +14,7 @@ macro_rules! transform {
 }
 
 fn main() {
-    let x = capture!(2 + 3);
-    println!("{}", x); // what this will print?
-}
+    // what will be output of this macro calls
+    dbg!(capture!(2 + 3));
+    dbg!(transform!(2 + 3));
+}

code/examples/stderr/misc_7.stderr

@@ -0,0 +1,2 @@
+[examples/misc_7.rs:18:5] capture!(2 + 3) = 5
+[examples/misc_7.rs:19:5] transform!(2 + 3) = 6

src/misc/7.md

@@ -9,9 +9,14 @@
 <details>
 <summary>Solution</summary>
 
-It will prints `5`.
+The actual output will be:
 
-Once a token is captured as an expression (`:expr`), it becomes opaque to macro pattern matching and cannot be destructured into its component tokens. 
+```
+[src/main.rs:17:5] capture!(2 + 3) = 5
+[src/main.rs:18:5] transform!(2 + 3) = 6
+```
+
+Because once a token is captured as an expression (`:expr`), it becomes opaque to macro pattern matching and cannot be destructured into its component tokens. 
 
 When `capture!(2 + 3)` is invoked, the `$e:expr` matcher captures `2 + 3` as a single expression token tree. This captured expression is then passed to `transform!($e)`, which attempts to match it against the pattern `$a:tt + $b:tt`.