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    $\begingroup$ In addition {42.}~MatchQ~(x0 : {__} : {1.}) yields False but {42.}~MatchQ~(x0 : {_} : {1.}) yields True. And Traceing doesn't illuminate anything: Trace[{42.}~MatchQ~(x0 : {___} : {1.})] yields {MatchQ[{42.}, x0 : {___} : {1.}], False}. $\endgroup$ Commented Aug 25, 2016 at 16:10
  • $\begingroup$ So I guess this is a bug? $\endgroup$ Commented Aug 25, 2016 at 20:06
  • $\begingroup$ I filed a report. $\endgroup$ Commented Aug 25, 2016 at 20:25
  • 2
    $\begingroup$ similar: (72290). $\endgroup$ Commented Aug 25, 2016 at 21:06
  • $\begingroup$ @WReach We have to get Daniel here ;) $\endgroup$ Commented Aug 26, 2016 at 1:52