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[ty] Fix 'too many cycle iterations' for unions of literals (#20137)

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## Summary

Decrease the maximum number of literals in a union before we collapse to
the supertype. The better fix for this will be
https://github.com/astral-sh/ty/issues/957, but it is very tempting to
solve this for now by simply decreasing the limit by one, to get below
the salsa limit of 200.

closes https://github.com/astral-sh/ty/issues/660

## Test Plan

Added a regression test that would previously lead to a "too many cycle
iterations" panic.
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David Peter 2025-08-28 16:46:37 +02:00 • committed by GitHub
parent b3c4005289
commit 1842cfe333
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5
crates/ty_python_semantic/src/types/builder.rs
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@ -202,7 +202,10 @@ enum ReduceResult<'db> {
// TODO increase this once we extend `UnionElement` throughout all union/intersection
// representations, so that we can make large unions of literals fast in all operations.
const MAX_UNION_LITERALS: usize = 200;
//
// For now (until we solve https://github.com/astral-sh/ty/issues/957), keep this number
// below 200, which is the salsa fixpoint iteration limit.
const MAX_UNION_LITERALS: usize = 199;
pub(crate) struct UnionBuilder<'db> {
elements: Vec<UnionElement<'db>>,