Merge #3700

3700: fill match arms with empty block rather than unit tuple r=matklad a=JoshMcguigan

As requested by @Veetaha in #3689 and #3687, this modifies the fill match arms assist to create match arms as an empty block `{}` rather than a unit tuple `()`.

In one test I left one of the pre-existing match arms as a unit tuple, and added a body to another match arm, to demonstrate that the contents of existing match arms persist. 

Co-authored-by: Josh Mcguigan <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/docs/user/assists.md b/docs/user/assists.md
index e2850b4dd..f3ce6b0e0 100644
--- a/docs/user/assists.md
+++ b/docs/user/assists.md
@@ -267,8 +267,8 @@ enum Action { Move { distance: u32 }, Stop }
 
 fn handle(action: Action) {
     match action {
-        Action::Move { distance } => (),
-        Action::Stop => (),
+        Action::Move { distance } => {}
+        Action::Stop => {}
     }
 }
 ```