$ perl -M5.014 -e1
Perl v5.14.0 required--this is only v5.12.2, stopped.
BEGIN failed--compilation aborted.

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I fail to understand how that answers my question:
I don't know whether there's a (single-line) syntax that at compile time checks for 5.10, but which doesn't enable features.
If I substitute 5.010 for 5.014, 5.10 features are enabled: 
$ perl -M5.010 -e 'say "foo"'
foo

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In reply to Re^3: Why version strings? by JavaFan
in thread Why version strings? by gunzip

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