#define CHECKOP(type,o) \
((PL_op_mask && PL_op_mask[type]) \
? ( op_free((OP*)o), \
- Perl_croak(aTHX_ "%s trapped by operation mask", PL_op_desc[type]), \
+ Perl_croak(aTHX_ "'%s' trapped by operation mask", PL_op_desc[type]), \
Nullop ) \
: CALL_FPTR(PL_check[type])(aTHX_ (OP*)o))