Re: [groff] address@hidden: Bug#920269: groff: gropdf can execute arbitrary commands]

[Jakub Wilk]

* Colin Watson <address@hidden>, 2019-01-23, 13:56:
> Perl >= 5.20 has the safer <<>> operator,

It was actually added only in Perl 5.22.
perl5220delta man page says:

New double‐diamond operator

"<<>>" is like "<>" but uses three‐argument "open" to open each file in 
@ARGV.  This means that each element of @ARGV will be treated as an 
actual file name, and "|foo" won’t be treated as a pipe open.

--
Jakub Wilk