I would like to generate random hash, i.e. where key is random number and value is also random number 

my @x = map { rand => rand } (0 .. 5)
Compile error: syntax error at (eval 310) line 5, near "} ("
BEGIN not safe after errors--compilation aborted at (eval 310) line 5.

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Mean while, the following works: 

my @x = map { rand() => rand } (0 .. 5);

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WBR, basiliscos.

In reply to what's wrong with that syntax construction? by basiliscos

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