Allow When nodes to grab trailing comments away from their statements lists.

Author: kddnewton

CHANGELOG.md

@@ -41,6 +41,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 - Ensure trailing comments on parameter declarations are consistent.
 - Make `Command` and `CommandCall` aware that their arguments could exceed their normal expected bounds because of heredocs.
 - Only unescape forward slashes in regular expressions if converting from slash bounds to `%r` bounds.
+- Allow `When` nodes to grab trailing comments away from their statements lists.
 
 ### Removed
 

lib/syntax_tree.rb

@@ -12759,7 +12759,10 @@ def on_when(arguments, statements, consequent)
     beginning = find_token(Kw, "when")
     ending = consequent || find_token(Kw, "end")
 
-    statements.bind(arguments.location.end_char, ending.location.start_char)
+    statements.bind(
+      find_next_statement_start(arguments.location.end_char),
+      ending.location.start_char
+    )
 
     When.new(
       arguments: arguments,