Perl 6 will interpolate spacetab-separated pairs, one per line, though the restrictions on interpolating arrays and hashes are tightened a bit to avoid accidental interpolation of email addresses and printf formats. You have to do something like: 
    say "Array is @array[]";
    say "Array is {@array}";
    say "Hash is %hash{}";
    say "Hash is {%hash}";

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Only scalars interpolate without some kind of bracketing.

The space-separated form was chosen to make it easy to split on whitespace, but it's expected that most hash interpolations will in fact specify some more explicit format: 

    say "Hash is %hash.as('%s => %s', ', ')";

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In reply to Re^2: printing hashes by TimToady
in thread printing hashes by Anonymous Monk

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