Fix 25830 Inference of Capture-Polymorphic Lambdas#25853
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bracevac wants to merge 2 commits intoscala:mainfrom
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Fix 25830 Inference of Capture-Polymorphic Lambdas#25853bracevac wants to merge 2 commits intoscala:mainfrom
bracevac wants to merge 2 commits intoscala:mainfrom
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Apr 20, 2026
| needsVariable(parent) | ||
| && refs.isConst // if refs is a variable, no need to add another | ||
| && !refs.isUniversal // if refs is {caps.any}, an added variable would not change anything | ||
| && !refs.elems.exists(_.coreType.derivesFromCapSet) |
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@odersky the exists instead of forall is for the case we have mixed retains of the form {C, x}.
Originally added in scala#24560 to strip inferred retains from inlined call trees before they reach the pickler. The cc setup pipeline now handles retains correctly without this preemptive strip, and removing it leaves scala3-bootstrapped/testCompilation green.
Fixes scala#25830. Covers plain poly lambdas, curried lambdas, mixed outer/local scopes, capset type members, and bounded polymorphism (see tests/pos-custom-args/captures/i25830*).
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Continues in #25905 |
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Fixes #25830
Alternative to #25833
How much have you relied on LLM-based tools in this contribution?
Extensively, for everything.
How was the solution tested?
New automated tests (including the issue's reproducer, if applicable)