hpcc-systems/HPCC-Platform — pull request #1879 by ghalliday (2012-03-15 17:10:04+00:00)
Title: Fix very obscure bug in folding case() = value

case(x,a1=>'a',a1=>'b','a')='a' was incorrectly converted to
x not in a1 because it wasn't taking into account previous (duplicate)
values that had matched - they differed only by an annotation.

Signed-off-by: Gavin Halliday