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Allow nested generic specialization keys - #1266

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Frotty merged 11 commits into
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codex/nested-generic-specialization
Aug 29, 2026
Merged

Allow nested generic specialization keys#1266
Frotty merged 11 commits into
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codex/nested-generic-specialization

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@Frotty

@Frotty Frotty commented Aug 29, 2026

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Summary

  • allow fully concrete nested generic types in structural specialization keys
  • add an exact Lua regression for List<List<Item>>-style generic static storage
  • add deterministic nested generic/tuple/class and class/interface/module backend parity matrices

Why

GenericTypes rejected every parameterized type argument even though its equality, hashing, naming, and type-variable traversal already handle nested types recursively. This caused a translation-time Type arguments must not be generic failure after source typechecking succeeded.

The change removes that obsolete invariant instead of adding a backend or stdlib workaround.

Verification

  • exact regression failed with the reported exception before the fix and passes after it
  • LuaBackendAuditTests, GenericsTests, and GenericsWithTypeclassesTests pass together
  • exact renamed regression rerun immediately before commit: pass
  • tests exercise the normal interpreter/JASS transform configurations and real Lua execution

The full suite was intentionally left to CI.

Known separate follow-ups

  • the intermittent <source of NoExpr not found>:1: null diagnostic was recovered from logs as a StackOverflowError in compiletime-state partition analysis; it is not reproduced or changed here
  • deeper tuple-to-generic-class field-selection fuzzing exposed a separate existing IM attribute-typing crash; this focused fix does not attempt a speculative pass-order repair

Acceptance criteria

  • nested concrete generic specialization keys compile for Lua
  • behavior remains aligned across JASS/interpreter and Lua execution
  • generated specialization remains deterministic for fixed inputs

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📝 Code Review Completed 2026-08-29T16:11:24.670297Z cdc2a90 Manual request
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@Frotty
Frotty merged commit 2668533 into master Aug 29, 2026
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@Frotty
Frotty deleted the codex/nested-generic-specialization branch August 29, 2026 16:33
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