[bug #65273] Potential bug in the info function?

[Ian Prest]

Follow-up Comment #8, bug#65273 (group make):

[comment #3 comment #3:]
> The problem is that (a) there is no way to create a variable name
containing, or consisting of, whitespace

Sure there is:

Makefile:
```
SPACE :=
SPACE := $(SPACE) $(SPACE)
$(SPACE) := $(SPACE)
$(warning [$( )])
```

Output:
```
Makefile:4: [ ]
make: *** No targets.  Stop.
```

I'm not sure where I learned this trick, but I think it was probably the John
Graham-Cumming book, so it's probably relatively widely known.

(Admittedly this will cause a warning with the latest HEAD.)


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