AST: Canonicalize opaque archetype substitution maps in the solver arena #86020
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Preserving sugar if we have type variables uses way too much memory. Canonicalize these substitution maps for now, as a (temporary?) workaround. In the future, if we decide preserving sugar is more important than a few dozen Mb of memory usage, we can also bump the arena memory limit, instead. Fixes rdar://166237860. Fixes rdar://165863647.
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Dec 12, 2025
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Preserving sugar if we have type variables uses way too much memory.
Canonicalize these substitution maps for now, as a (temporary?) workaround.
In the future, if we decide preserving sugar is more important than a few dozen Mb of memory usage, we can also bump the arena memory limit, instead.
Fixes rdar://166237860.
Fixes rdar://165863647.