Show DSLError when theres a SyntaxError

CHANGELOG.md

@@ -1,5 +1,15 @@
 # CocoaPods Core Changelog
 
+## Master
+
+##### Enhancements
+
+* A more useful DSLError will be shown when there are syntax errors in a Ruby
+  Podfile or Podspec.  
+  [Samuel Giddins](https://github.com/segiddins)
+  [CocoaPods#2651](https://github.com/CocoaPods/CocoaPods/issues/2651)
+
+
 ## 0.37.1
 
 This version only introduces changes in the CocoaPods gem.

lib/cocoapods-core/podfile.rb

@@ -249,14 +249,16 @@ def self.from_ruby(path)
         string.encode!('UTF-8')
       end
       podfile = Podfile.new(path) do
+        # rubocop:disable Lint/RescueException
         begin
           # rubocop:disable Eval
           eval(string, nil, path.to_s)
           # rubocop:enable Eval
-        rescue => e
+        rescue Exception => e
           message = "Invalid `#{path.basename}` file: #{e.message}"
           raise DSLError.new(message, path, e.backtrace, string)
         end
+        # rubocop:enable Lint/RescueException
       end
       podfile
     end

lib/cocoapods-core/specification.rb

@@ -606,7 +606,10 @@ def self._eval_podspec(string, path)
     # rubocop:disable Eval
     eval(string, nil, path.to_s)
     # rubocop:enable Eval
-  rescue => e
+
+    # rubocop:disable Lint/RescueException
+  rescue Exception => e
+    # rubocop:enable Lint/RescueException
     message = "Invalid `#{path.basename}` file: #{e.message}"
     raise DSLError.new(message, path, e.backtrace, string)
   end