in reply to FMTYEWTK about split //
It's also a barrier to integration of the defined-or patch to 5.8.x, since a // where perl may be expecting either an operator or a term could mean defined-or or could mean ($_ =~ //). Without the feature, the latter would be overwhelmingly less likely to occur in real code.
I'm not the world's best lexer, but I cannot imagine a situation where // could be misinterpreted. Your example, if I remember right, implies that I could write $_ =~ +;. =~ is the operator that requires a term on the RHS.
Unless, as is often the case, I'm missing something ...
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