Two-Fer exercise validation failing to run

```
Compile error: while parsing a block mapping
in reader, line 3, column 1:
use ys::taptest: :all
^
expected , but found ''
in reader, line 4, column 9:
load: ''two-fer'.ys'
^

two-fer-test.ys ..
Dubious, test returned 1 (wstat 256, 0x100)
No subtests run

Test Summary Report
-------------------
two-fer-test.ys (Wstat: 256 (exited 1) Tests: 0 Failed: 0)
Non-zero exit status: 1
Parse errors: No plan found in TAP output
Files=1, Tests=0, 0 wallclock secs ( 0.02 usr 0.02 sys + 0.01 cusr 0.02 csys = 0.07 CPU)
Result: FAIL
```