[bug #16531] Substitution reference and secondary expansion

[Paul D. Smith]

Update of bug #16531 (project make):

                  Status:                    None => Not A Bug              
             Assigned to:                    None => psmith                 
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #4:

I think the original description is not a bug.  As I said in my comment #3,
because make is not parsing the contents of the parens as a variable reference
(because we've escaped it), it's treating the ":" as a special character.  I
think this is just the behavior we have to accept: ":" is a special character
to make, just like "$" and "%" (in some contexts) so it needs to be escaped
sometimes.  This is not always obvious but I don't see any way to make it
better.

The separate issue, that escaping the colon causes problems, will be addressed
by bug #16545.

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