Give a nice human-friendly error message when problems loading Vfile

lib/vagrant/config/loader.rb

@@ -194,13 +194,18 @@ module Vagrant
       def procs_for_path(path)
         @logger.debug("Load procs for pathname: #{path}")
 
-        begin
         return Config.capture_configures do
+          begin
             Kernel.load path
-          end
           rescue SyntaxError => e
             # Report syntax errors in a nice way.
             raise Errors::VagrantfileSyntaxError, :file => e.message
+          rescue Exception => e
+            # Report the generic exception
+            raise Errors::VagrantfileLoadError,
+              :path => path,
+              :message => e.message
+          end
         end
       end
     end

lib/vagrant/errors.rb

@@ -428,6 +428,10 @@ module Vagrant
       error_key(:vagrantfile_exists)
     end
 
+    class VagrantfileLoadError < VagrantError
+      error_key(:vagrantfile_load_error)
+    end
+
     class VagrantfileSyntaxError < VagrantError
       status_code(41)
       error_key(:vagrantfile_syntax_error)

templates/locales/en.yml

@@ -278,6 +278,13 @@ en:
       vagrantfile_exists: |-
         `Vagrantfile` already exists in this directory. Remove it before
         running `vagrant init`.
+      vagrantfile_load_error: |-
+        There was an error loading a Vagrantfile. The file being loaded
+        and the error message are shown below. This is usually caused by
+        a syntax error.
+
+        Path: %{path}
+        Message: %{message}
       vagrantfile_syntax_error: |-
         There is a syntax error in the following Vagrantfile. The syntax error
         message is reproduced below for convenience:

test/unit/vagrant/config/loader_test.rb

@@ -175,5 +175,10 @@ describe Vagrant::Config::Loader do
       expect { instance.set(:file, temporary_file("Vagrant:^Config")) }.
         to raise_exception(Vagrant::Errors::VagrantfileSyntaxError)
     end
+
+    it "should raise a proper error if there is a problem with the Vagrantfile" do
+      expect { instance.set(:file, temporary_file("foo")) }.
+        to raise_exception(Vagrant::Errors::VagrantfileLoadError)
+    end
   end
 end