CLI debugging of matching-brackets throws error in test library

@glennj I’m getting

c:\Users\bugma\Dropbox\Exercism\8th\matching-brackets>8th test.8th
Exception: Unknown l:: at line 67 byte 1593 in libs/exercism/test: G:sthrow: task REPL

and line 67 of that file is

   \ otherwise fall back to 'lazy evaluation'
   l: =

This exercise was pulled down using

exercism download --track=8th --exercise=matching-brackets --force