docs: fix README.md doctests

README.md

@@ -3,7 +3,7 @@
 `matchbox::match_deref!{...}` is a procedural macro, which allows you to use deref patterns right now in stable Rust.
 
 For example:
-```rust
+```rust,no_run
 use std::rc::Rc;
 
 enum Value {
@@ -33,24 +33,30 @@ I. e. it is possible that your arms are exhaustive, but the compiler will not be
 The macro calls `Deref::deref` internally. Keep in mind that `Deref::deref` takes REFERENCE to smart pointer and returns REFERENCE to pointee. So this code will work: `match &Nil { Deref @ x => ... }`, but this will not: `match Nil { Deref @ x => ... }`.
 
 Consider this code:
-```rust
+```rust,ignore
 matchbox::match_deref!{
     match v {
-        Symbol(Deref @ x) => some_code_here,
-        _ => other_code_here,
+        Symbol(Deref @ x) => {
+            // some_code_here
+        }
+        _ => {
+            // other_code_here,
+        }
     }
 }
 ```
 
 It will be desugared to something like this:
-```rust
+```rust,ignore
 match v {
     Symbol(a0) if (if let x = Deref::deref(a0) { true } else { false }) => if let x = Deref::deref(a0) {
-        some_code_here
+        // some_code_here
     } else {
         panic!()
-    },
-    _ => other_code_here,
+    }
+    _ => {
+        // other_code_here
+    }
 }
 ```