Temporal: for/if/loop/return nodes stamped with the next statement's line (what is i at N answers for a line that never assigns i)
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还没有人认领这个 Issue。
评估
调研方向
Start in the parser and temporal tracing code, then run the existing temporal tests around line-based lookup and trace tape generation. Add coverage for for/if/loop/return nodes, indexed/field/destructuring stores, and the end-of-file stamp; use the Done when checklist and docs/TRACE.md to verify the resulting behavior.
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描述
Found by the builder on #1377. This predates it and exists on base too.
The parser stamps if/loop/for/return nodes with the line of the token that FOLLOWS them, not their own line. For a for loop variable this is silent-wrong: what is i at 4 returns 2 when line 4 never assigns i.
Related, from the same survey:
- Every trace tape starts with a spurious
Lstamp for the line after the end of the file. - Stores other than a plain assignment (
d[k] is v,d.k is v, destructuring) are stamped differently from plain assignment. - A call assignment is recorded under the callee's last line.
The filing rule for multi-line statements is #1381's decision. This issue is about nodes stamped with a line that is not theirs at all.
Done when
-
for/if/loop/returnnodes carry their own keyword's line. A temporal test showswhat is i at Nreturns null (or the prior value) for a line that does not assigni. - The spurious end-of-file
Lstamp is gone, or explained in docs/TRACE.md. - Indexed, field and destructuring stores are stamped by the same rule as plain assignment. Covered by a test.
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