error: shift-reduce conflict:
       state: statement -> If LParen expr RParen statement •
              statement -> If LParen expr RParen statement • Else statement
       token: Else
  --> tests/ui/if_else_shift_reduce.rs:38:9
   |
38 |         If LParen expr[head] RParen statement[then] => Statement::If(
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^