[metapost] dependencies bug

[Boguslaw Jackowski]

Vadim:
> In the following minimal example showdependencies
> shows something inappropriate, which gives "This can't happen"

Daniel:
> In case it is important, Metapost 1.902 (TeX Live 2014)
> has the same behavior.

Earlier MPs (e.g., 1.211), and, needless to say, MF
do not curse "this can't happen". [I tested Vadim's
second example].

Cheers -- Jacko

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
  Bogus\l{}aw Jackowski: B_Jackowski at GUST.ORG.PL
----------------------------------------------------------------
  Hofstadter's Law: It always takes longer than you expect, even
                    when you take into account Hofstadter's Law.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-