Revert 72f0e37a3c201c0666 and 3f87260758f1ebe
Revert 72f0e37a3c201c0666 and 3f87260758f1ebe

The original rewrite of samecase broke tests.  THe naive fix for the exec
error caused hanging.  It is also not clear whether the solution is actually
a good one: http://irclog.perlgeek.de/perl6/2014-09-05#i_9302559

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