Runtime errorRE10143

Fix RE10143: historical offset beyond buffer limit

Size the specific historical buffer for the largest offset the script can request on any historical or realtime bar. The broken script trains the automatic buffer on 500 bars, then asks for 1,000 on realtime data, after Pine has stopped resizing it. `max_bars_back(close, 1000)` declares that requirement. Do not enlarge every buffer blindly, and never request beyond Pine’s supported history limit.

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Before and after

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Broken code.pine

//@version=6
indicator("Historical buffer demo")
float value = close[barstate.ishistory ? 500 : 1000]
plot(value)

Fixed code.pine

//@version=6
indicator("Historical buffer demo")
max_bars_back(close, 1000)
float value = close[barstate.ishistory ? 500 : 1000]
plot(value)

Diff.pine

--- broken.pine
+++ fixed.pine
@@
+max_bars_back(close, 1000)

Root causes

A realtime branch requests a larger offset than any branch used while historical buffers were sized.
A drawing anchored far in the past needs a larger `time` buffer even when its coordinates use `bar_index`.
A dynamic offset exceeds the supported history limit rather than only the current automatic buffer.

How the fix was verified

Method: Pineify UAT grammar checker via check-pine-script-grammar.mjs
Broken result: Returned no grammar diagnostics; the documented failure occurs on realtime execution.
Fixed result: Returned no grammar diagnostics.
Limit: Not runtime-tested. Reproduce realtime-only cases with live data or Bar Replay and size only the affected series.

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Runtime error

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