Hello,
the file `NEWS` contains 1.40.15 as date of introduction
for \pdfsuppresswarningpagegroup:
pdfTeX 3.14159265-2.6-1.40.15 (TeX Live 2014)
- changes:
- sync with Knuth TeX 3.14159265, e-TeX 2.6
- new warning-suppression parameter \pdfsuppresswarningpagegroup
But the documentation says
The primitive was introduced in pdfTEX 1.40.14.
Yours sincerely
Heiko Oberdiek
