Capture exception from failed specs

src/spectator/failed_example_result.cr

@@ -2,8 +2,13 @@ require "./example_result"
 
 module Spectator
   class FailedExampleResult < ExampleResult
+    getter error : Exception
+
     def passed? : Bool
       false
     end
+
+    def initialize(@example, @error)
+    end
   end
 end

src/spectator/runner.cr

@@ -19,8 +19,8 @@ module Spectator
     private def run_example(example)
       example.run
       SuccessfulExampleResult.new(example)
-    rescue
+    rescue ex : Exception
-      FailedExampleResult.new(example)
+      FailedExampleResult.new(example, ex)
     end
   end
 end