It was motivated by `ddclient`:
* `return <<`:
https://github.com/ddclient/ddclient/blob/e0611ab192d6b8d3d2b09d6868d063ca5591ad02/ddclient.in#L7200-L7223
* `fun(<<)` (although this particular example is not handled by this PR due to
string literal preceding `<<`):
https://github.com/ddclient/ddclient/blob/e0611ab192d6b8d3d2b09d6868d063ca5591ad02/ddclient.in#L2476-L2479
For a sample perl script:
```perl
#!/usr/bin/perl
use strict;
$a = <<"EOS";
use a proxy;
EOS
my $a = <<"EOS";
use b proxy;
EOS
my $a .= <<"EOS";
use c proxy;
EOS
sub f {
return <<"EOS";
use d proxy
EOS
}
f(<<"EOS");
use e proxy
EOS
```
Output before change:
```
perl(d)
perl(e)
perl(strict)
```
Output after change:
```
perl(strict)
```
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