I have a *.pm-File with the line
$chScale = (1 << TSL2561_LUX_CHSCALE);
Textastic prints everything green below the bit-operator <<
in Perl, "<<" can start a heredoc string.
While the Perl interpreter can decide if this is indeed a Heredoc string or a shift left operator, a simple language grammar can't, because it doesn't know that TSL2561_LUX_CHSCALE is a constant.
If you save the constant in a variable first and use that to do the binary left shift, it is highlighted correctly:
$shift = TSL2561_LUX_CHSCALE;$chScale = (1 << $shift);
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