make: char-000a-new-line.mk:14: used
make: char-000a-new-line.mk:14: +
make: char-000a-new-line.mk:14: word
make: char-000a-new-line.mk:28: used + word
make: char-000a-new-line.mk:30: used + word
make: char-000a-new-line.mk:32: used + word
make: char-000a-new-line.mk:34: used + word
make: char-000a-new-line.mk:36: used + word
make: char-000a-new-line.mk:38: used + word
make: char-000a-new-line.mk:40: used + word
make: char-000a-new-line.mk:42: + used word
make: char-000a-new-line.mk:44: used + word
make: char-000a-new-line.mk:46: used + word
make: char-000a-new-line.mk:48: used + word
make: char-000a-new-line.mk:50: 3
make: char-000a-new-line.mk:52: used + word
make: char-000a-new-line.mk:54: 1234567 1234567 1234567
make: char-000a-new-line.mk:56: 1 2 3
make: char-000a-new-line.mk:58: used + word
make: char-000a-new-line.mk:60: used + word
make: char-000a-new-line.mk:62: used + word
make: don't know how to make + (continuing)

Stop.
make: stopped making "+" in unit-tests
exit status 1