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$ perl -E " $_ = 123; m/\d(?{ warn pos })/"
1 at (re_eval 5) line 1.

...
$ perl -E " no re qw/eval/; $_ = 123; $f = qr/\d(?{ warn pos })/; m/$f
+/;"
1 at (re_eval 5) line 1.

$ perl -E " $_ = 123; $f = '(?{ warn pos })';  m/\d$f/; "
Eval-group not allowed at runtime, use re 'eval' in regex m/\d(?{ warn
+ pos })/ at -e line 1.

$ perl -E " $_ = 123; $f = '(?{ warn pos })';  $g = qr/\d$f/; m/$g/"
Eval-group not allowed at runtime, use re 'eval' in regex m/\d(?{ warn
+ pos })/ at -e line 1.