Combine sugar, salt, cinnamon, and ginger in a bowl. Lightly beat in two eggs. Stir in canned pumpkin and Guinness beer until well combined. Pour mixture into pie shell; preheat oven to 425 degrees and bake for 15 minutes. Reduce heat to 350 degrees, and bake an additional 45-50 minutes, or until fork placed in center of the pie comes out clean. Cool, and serve.