Fix instantiated string interpolation constraints#10160
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rtfeldman
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July 17, 2026 16:42
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Fixes #10109 by making interpolation constraint metadata own each part’s type variable and source region. Instantiation now remaps part variables while preserving their use-site regions, and both builtin and custom interpolation checks consume that metadata so polymorphic interpolation reports the instantiated type mismatch at the interpolation expression.