Your subs are expected to return a string.

For example, the second test passes with the following definition for IsThaiMCons: 

sub IsThaiMCons {
    return <<'.';
0E01
0E08
0E0E 0E0F
0E14 0E15
0E1A 0E1B
0E2D
.
}

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In reply to Re^2: Listing out the characters included in a character class by ikegami
in thread Listing out the characters included in a character class by Polyglot

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