Make RubyVM::AbstractSyntaxTree.of raise for method/proc created in eval

This changes Thread::Location::Backtrace#absolute_path to return
nil for methods/procs defined in eval.  If the realpath of an iseq
is nil, that indicates it was defined in eval, in which case you
cannot use RubyVM::AbstractSyntaxTree.of.

Fixes [Bug #16983]

Co-authored-by: Koichi Sasada <ko1@atdot.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/iseq.c b/iseq.c
index 9af7b54eff..47bc108d3e 100644
--- a/iseq.c
+++ b/iseq.c
@@ -1115,6 +1115,12 @@ rb_iseq_absolute_path(const rb_iseq_t *iseq)
     return rb_iseq_realpath(iseq);
 }
 
+int
+rb_iseq_from_eval_p(const rb_iseq_t *iseq)
+{
+    return NIL_P(rb_iseq_realpath(iseq));
+}
+
 VALUE
 rb_iseq_label(const rb_iseq_t *iseq)
 {