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$(shell touch foo.testfile1 foo.testfile2)
# when a rule has commands and no prerequisites, should it be executed?
# double-colon: yes
# single-colon: no
all: foo.testfile1 foo.testfile2
test "$$(cat foo.testfile1)" = ""
test "$$(cat foo.testfile2)" = "remade:foo.testfile2"
@echo TEST-PASS
foo.testfile1:
@echo TEST-FAIL
foo.testfile2::
printf "remade:$@"> $@
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