-include completely turns off errors

[Noel Yap]

I have the following makefile:

-include foo.mk

.PHONY: all
all: foo.mk
        @echo all
Since there's no rule to create foo.mk, I'd expect the build to fail since all is dependent on foo.mk, but it seems that the -include turns off this error.  Is this a bug?

Thanks,
Noel
PS
This throws a kink into the "delayed error message" workaround for "include" that I 
had proposed.
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