Fix parsing of mutiple assignment with rescue modifier

Single assignment with rescue modifier applies rescue to the RHS:

  a = raise rescue 1 # a = (raise rescue 1)

Previously, multiple assignment with rescue modifier applied rescue
to the entire expression:

  a, b = raise rescue [1, 2] # (a, b = raise) rescue [1, 2]

This makes multiple assignment with rescue modifier consistent with
single assignment with rescue modifier, applying rescue to the RHS:

  a, b = raise rescue [1, 2] # a, b = (raise rescue [1, 2])

Implements [Feature #8239]
Fixes [Bug #8279]

1 files changed, 5 insertions, 0 deletions

diff --git a/test/ruby/test_assignment.rb b/test/ruby/test_assignment.rb
index c1f8c46890..c14568fde3 100644
--- a/test/ruby/test_assignment.rb
+++ b/test/ruby/test_assignment.rb
@@ -92,6 +92,11 @@ class TestAssignment < Test::Unit::TestCase
     a,b,*c = *[*[1,2]]; assert_equal([1,2,[]], [a,b,c])
   end
 
+  def test_assign_rescue
+    a = raise rescue 2; assert_equal(2, a)
+    a, b = raise rescue [3,4]; assert_equal([3, 4], [a, b])
+  end
+
   def test_assign_abbreviated
     bug2050 = '[ruby-core:25629]'
     a = Hash.new {[]}