Trim off licenses when showing solutions (#1212)

The licenses end up in the PO files, causing extra unnecessary for work
our translators. We save about 300 lines from each PO file with this.

This also solves another small problem: when a file is included with an
anchor, other anchors are automatically stripped away. This removes some
confusing `// ANCHOR: foo` and `// ANCHOR_END: foo` lines in the
solutions.

src/exercises/concurrency/chat-async/src/bin/client.rs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// ANCHOR: solution
 // ANCHOR: setup
 use futures_util::stream::StreamExt;
 use futures_util::SinkExt;

src/exercises/concurrency/chat-async/src/bin/server.rs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// ANCHOR: solution
 // ANCHOR: setup
 use futures_util::sink::SinkExt;
 use futures_util::stream::StreamExt;

src/exercises/concurrency/dining-philosophers-async.rs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// ANCHOR: solution
 // ANCHOR: Philosopher
 use std::sync::Arc;
 use tokio::time;

src/exercises/concurrency/dining-philosophers.rs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// ANCHOR: solution
 // ANCHOR: Philosopher
 use std::sync::{mpsc, Arc, Mutex};
 use std::thread;

src/exercises/concurrency/link-checker.rs

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// ANCHOR: solution
 use std::{sync::Arc, sync::Mutex, sync::mpsc, thread};
 
 // ANCHOR: setup

src/exercises/concurrency/solutions-afternoon.md

@@ -5,7 +5,7 @@
 ([back to exercise](dining-philosophers-async.md))
 
 ```rust,compile_fail
-{{#include dining-philosophers-async.rs}}
+{{#include dining-philosophers-async.rs:solution}}
 ```
 
 ## Broadcast Chat Application
@@ -15,12 +15,12 @@
 `src/bin/server.rs`:
 
 ```rust,compile_fail
-{{#include chat-async/src/bin/server.rs}}
+{{#include chat-async/src/bin/server.rs:solution}}
 ```
 
 `src/bin/client.rs`:
 
 ```rust,compile_fail
-{{#include chat-async/src/bin/client.rs}}
+{{#include chat-async/src/bin/client.rs:solution}}
 ```
 

src/exercises/concurrency/solutions-morning.md

@@ -5,7 +5,7 @@
 ([back to exercise](dining-philosophers.md))
 
 ```rust
-{{#include dining-philosophers.rs}}
+{{#include dining-philosophers.rs:solution}}
 ```
 
 ## Link Checker
@@ -13,5 +13,5 @@
 ([back to exercise](link-checker.md))
 
 ```rust,compile_fail
-{{#include link-checker.rs}}
+{{#include link-checker.rs:solution}}
 ```