Heat oven to 350°F (175°C). Fit crust into a 9-inch pie plate, crimp, and set on a baking sheet.
Scatter chocolate over the bottom of the crust, then the chopped pecans.
Whisk corn syrup, both sugars, eggs, cooled melted butter, vanilla and salt until just combined.
Slowly pour filling over the pecans. Top with a few pecan halves if you like.
Bake 55–65 minutes until the center only slightly jiggles (200°F). Shield the crust edges with foil after 25 minutes if browning fast.
Cool on a rack at least 3 hours before slicing.