AT has off-by-one error for indexes < 1.

[Siskin-Bot]

Submitted by: BrianH

AT series 0 is the same as AT series 1. For 1-based indexing, the 0 index should be one back from the current position, the -1 index two back, and so on.

This bug prevents calculation of the index argument, which is necessary for simulating 0-based indexing amongst other things. Both blocks and strings are affected.

Note: R2 also has this bug.

---

^{Imported from: CureCode [ Version: alpha 33 Type: Bug Platform: All Category: Unspecified Reproduce: Always Fixed-in:none ]
Imported from: metaeducation#609}

Comments:

Rebolbot commented on Mar 5, 2014:

Submitted by: BrianH

According to the index compromise in #2117 this is not a bug.

---

Rebolbot commented on Mar 6, 2014:

Submitted by: abolka

According to #2117 a part of this ticket is still important: AT series 0 should cause an error. But it's best to track that in a separate ticket.

---

Rebolbot mentioned this issue on Jan 12, 2016:
Make VECTOR! of same index-base as other series

---

Rebolbot added on Jan 12, 2016

---

Oldes added a commit to Oldes/Rebol3 that referenced this issue on Jun 13, 2018:
FEAT/FIX: Picking the right PICK

---

Oldes mentioned this pullrequest on Jun 13, 2018:
FEAT/FIX: Picking the right PICK

---

Hostilefork added a commit to metaeducation/ren-c that referenced this issue on Jun 14, 2018:
Restore Rebol2-era PICKing/PATHing of negative/zero indices

---

Hostilefork mentioned this pullrequest on Jun 14, 2018:
Restore Rebol2-era PICKing/PATHing of negative/zero indices

---