proc.c: assume rb_iseq_location_t::first_lineno is always availablewip-topic/thread-fix-start-with-empty-iseq

rb_iseq_location_t::first_lineno (typically referenced as
iseq->body->location.first_lineno, where iseq is an rb_iseq_t *) can
always be assumed to contain a Fixnum regardless of whether struct
rb_iseq_constant_body::line_info_table (likewise,
iseq->body->line_info_table) is NULL or non-NULL.

This fixes TypeError on starting a new thread with an empty Proc with
trace instructions disabled. The TypeError comes from thread_pthread.c,
in native_set_thread_name(), where it expects the line number returned
from rb_proc_location(). The number can be nil if the line_info_table is
NULL. The check seems to be the remains from the days before the
dedicated 'first_lineno' field was introduced. So remove it.

This also modifies two other places, Proc#to_s and method redefinition
code, in the same way.

0 files changed, 0 insertions, 0 deletions