PPI is in no way robust enough for this use case. Source filters will never be appropriate for production use. 
use strict;
use warnings;
use experimental 'signatures';
use Nice::Try;

sub foo { 1 }
try {
  my $k = sub ($f = foo()) {};
}
catch ($e) {
  warn "caught: $e";
}
__END__
Global symbol "$e" requires explicit package name (did you forget to d
+eclare "my $e"?) at bad-syntax.pl line 10.
syntax error at bad-syntax.pl line 10, near ") {"
Execution of bad-syntax.pl aborted due to compilation errors.

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The module has other serious issues: 
use strict;
use warnings;
use Nice::Try;

{
  package MyException;
  use overload '""' => 'message';
  sub message { $_[0]->{message} }
  sub new { my $class = shift; bless { @_ }, $class }
  sub throw { my $class = shift; die $class->new(message => shift) }
}

try {
  MyException->throw("hi\n");
}
catch (MyException $e) {
  warn "working catch: $e";
}
catch ($e) {
  warn "broken catch: $e";
}
__END__
$ perl bad-exception.pl
broken catch: hi at bad-exception.pl line 21.

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In reply to Re^7: Perl try { } catch(e) { } by Haarg
in thread Perl try { } catch(e) { } by Superfox il Volpone

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