AST changes on Week 5 are not all bolded

[retop56]

The AST addition "Assign(string, exp)" on week 5 is not bolded. First image shows the AST definition on week 4, and second image shows the unbolded addition of the Assign AST on week 5.

[nlsandler]

Thanks for reporting this! Just fixed it - the Assign constructor is now bolded in this listing.