That (use 5.10) will give an error, because it means to require perl version 5.100.000. Instead, say use 5.010; or use 5.010_000; or use 5.10.0; or use v5.10; or use v5.10.0;.

(I've fallen to this trap yesterday when trying 5.10 out, but the error message is nice enough:

Perl v5.100.0 required (did you mean v5.10.0?)--this is only v5.10.0, 
+stopped at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
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