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t/op/smartkve.t: single-quote some eval stuff
Three tests were wrong because they incorrectly double- rather than
single-quoted an eval string like
eval "keys $hash ...."
Since the tests were supposed to generate syntax errors anyway it didn't
show up. However, the $hash ref was being expanded to HASH(0x......)
and on some platform / compiler permutations it would generate some
mysterious
Hexadecimal number > 0xffffffff non-portable
warnings.