The =Pair= constructor =Pair(x, y)= was used in =thread= and traversals for distribution of environments during traversal.

The =Pair= constructor has become obsolete with the introduction of FixedLengthTuple in StrategoRelease07.

Until StrategoRelease071 the =Pair= constructor will be defined as an overlay
<verbatim>
overlays
  Pair(x, y) = (x, y)
</verbatim>

After that it will be removed from the library.

-- Main.EelcoVisser - 06 Jan 2002 <br />
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