make: char-005c-reverse-solidus.mk:57: Unclosed expression, expecting "}" for modifier "Mx\}"
	while evaluating variable "BACKSLASH" with value ""
make: char-005c-reverse-solidus.mk:64: Unclosed expression, expecting "}" for modifier "Mx\\}"
	while evaluating variable "BACKSLASH" with value ""
make: char-005c-reverse-solidus.mk:71: Unclosed expression, expecting "}" for modifier "Mx\\\\\\\\}"
	while evaluating variable "BACKSLASH" with value ""
make: char-005c-reverse-solidus.mk:100: Unfinished backslash at the end in pattern "\" of modifier ":M"
	while evaluating variable "BACKSLASH" with value "\"
make: char-005c-reverse-solidus.mk:111: Unclosed expression, expecting "}" for modifier "M${:U\\\\}} != "\\""
	while evaluating variable "BACKSLASH" with value ""
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1