disco-0.1.6: test/error-nonlinear/expected

While checking REPL.f:
  Error: pattern (x, x) contains duplicate variable x.
  https://disco-lang.readthedocs.io/en/latest/reference/nonlinear.html
Error: pattern (x, left(y, x)) contains duplicate variable x.
https://disco-lang.readthedocs.io/en/latest/reference/nonlinear.html