Support Ruby 2.3.0's safe navigation operator

* lisp/progmodes/ruby-mode.el (ruby-smie--forward-token)
(ruby-smie--backward-token): Tokenize '&.' as '.'.
(ruby-smie--implicit-semi-p): Check for possible '&' before '.'.

* test/indent/ruby.rb: Add an example using safe navigation
operator.  Fix a syntax error in existing example.

1 files changed, 5 insertions, 4 deletions

diff --git a/test/indent/ruby.rb b/test/indent/ruby.rb
index 585263d02a6..51923f79373 100644
--- a/test/indent/ruby.rb
+++ b/test/indent/ruby.rb
@@ -24,8 +24,8 @@ d = %(hello (nested) world)
 # Don't propertize percent literals inside strings.
 "(%s, %s)" % [123, 456]
 
-"abc/#{def}ghi"
-"abc\#{def}ghi"
+"abc/#{ddf}ghi"
+"abc\#{ddf}ghi"
 
 # Or inside comments.
 x = # "tot %q/to"; =
@@ -303,8 +303,9 @@ foo ^
   bar
 
 foo_bar_tee(1, 2, 3)
-  .qux.bar
-  .tee
+  .qux&.bar
+  .tee.bar
+  &.tee
 
 foo do
   bar