[Aorai] Use semicolons to separate metavariable assignements

src/plugins/aorai/tests/ya/metavariables-right.ya

@@ -3,11 +3,12 @@
 %deterministic;
 
 $x : int;
+$y : int;
 
 a : { CALL(main) } -> b;
 
 b :
-  { CALL(f) } $x := f().x -> c
+  { CALL(f) } $y := $x; $x := f().x -> c
 | { CALL(g) } -> d
 ;
 

src/plugins/aorai/yaparser.mly

@@ -400,8 +400,8 @@ actions
   ;
 
 non_empty_actions
-  : non_empty_actions action { $1 @ [$2] }
-  | action                   { [$1] }
+  : non_empty_actions SEMI_COLON action { $1 @ [$3] }
+  | action                              { [$1] }
   ;
 
 action