Don't clobber _ex_ on typoes

lib/pry/pry_instance.rb

@@ -257,7 +257,12 @@ class Pry
         output.puts "Error: #{e.message}"
       end
 
+      begin
         break if complete_expression?(eval_string)
+      rescue SyntaxError => e
+        output.puts "SyntaxError: #{e.message.sub(/.*syntax error, */m, '')}"
+        eval_string = ""
+      end
     end
 
     @suppress_output = true if eval_string =~ /;\Z/ || eval_string.empty?

test/test_syntax_checking.rb

@@ -55,4 +55,9 @@ describe Pry do
     pry = Pry.new
     pry.complete_expression?("puts 1, 2,\n3").should == true
   end
+
+  it "should not clobber _ex_ on a SyntaxError in the repl" do
+
+    mock_pry("raise RuntimeError, 'foo';", "puts foo)", "_ex_.is_a?(RuntimeError)").should =~ /^RuntimeError.*\nSyntaxError.*\n=> true/m
+  end
 end