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-An example of an attribute procedural macro. The `#[trace_var(...)]` attribute
-prints the value of the given variables each time they are reassigned.
-
-- [`trace-var/src/lib.rs`](trace-var/src/lib.rs)
-- [`example/src/main.rs`](example/src/main.rs)
-
-Consider the following factorial implementation.
-
-```rust
-#[trace_var(p, n)]
-fn factorial(mut n: u64) -> u64 {
-    let mut p = 1;
-    while n > 1 {
-        p *= n;
-        n -= 1;
-    }
-    p
-}
-```
-
-Invoking this with `factorial(8)` prints all the values of `p` and `n` during
-the execution of the function.
-
-```
-p = 1
-p = 8
-n = 7
-p = 56
-n = 6
-p = 336
-n = 5
-p = 1680
-n = 4
-p = 6720
-n = 3
-p = 20160
-n = 2
-p = 40320
-n = 1
-```
-
-The procedural macro uses a syntax tree [`Fold`] to rewrite every `let`
-statement and assignment expression in the following way:
-
-[`Fold`]: https://docs.rs/syn/1.0/syn/fold/trait.Fold.html
-
-```rust
-// Before
-let VAR = INIT;
-
-// After
-let VAR = { let VAR = INIT; println!("VAR = {:?}", VAR); VAR };
-```
-
-```rust
-// Before
-VAR = INIT
-
-// After
-{ VAR = INIT; println!("VAR = {:?}", VAR); }
-```