Perf regression: executing the same constrained listing/mapping type results in huge delegate chains #252

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adam · 2025-12-30T01:22:45+01:00

adam commented

2025-12-30 01:22:45 +01:00

Originally created by @bioball on GitHub (Nov 21, 2024).

Originally assigned to: @stackoverflow on GitHub.

For example, this code results in 500 delegates:

function foo(elem: Listing<Int>(length == 1)) =
  if (elem[0] == 500) elem[0]
  else foo(new { elem[0] + 1 })

res = foo(new Listing { 0 })

Originally created by @bioball on GitHub (Nov 21, 2024). Originally assigned to: @stackoverflow on GitHub. For example, this code results in 500 delegates: ```pkl function foo(elem: Listing<Int>(length == 1)) = if (elem[0] == 500) elem[0] else foo(new { elem[0] + 1 }) res = foo(new Listing { 0 }) ```

adam closed this issue

2025-12-30 01:22:45 +01:00

adam referenced this issue

2025-12-30 01:24:52 +01:00

[PR #252] [MERGED] Fix patch file #480

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Reference: starred/pkl#252