irb.rb: restore the last error

* lib/irb.rb (eval_input): restore the last error `$!`, as the
  previous result.  [Feature #14684]

* lib/irb/context.rb (evaluate): add `exception` keyword argument
  to set the last error.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/irb.rb b/lib/irb.rb
index 16c03e964f..98bcac016d 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -439,6 +439,8 @@ module IRB
 
     # Evaluates input for this session.
     def eval_input
+      last_error = nil
+
       @scanner.set_prompt do
         |ltype, indent, continue, line_no|
         if ltype
@@ -488,7 +490,7 @@ module IRB
         signal_status(:IN_EVAL) do
           begin
             line.untaint
-            @context.evaluate(line, line_no)
+            @context.evaluate(line, line_no, exception: last_error)
             output_value if @context.echo?
             exc = nil
           rescue Interrupt => exc
@@ -497,6 +499,7 @@ module IRB
           rescue Exception => exc
           end
           if exc
+            last_error = exc
             handle_exception(exc)
           end
         end