Fix type_newtype from issue #14842 - #14983
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sidkshatriya
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Aug 4, 2026
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| (* Bug #1842b *) |
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Typo. (* Bug #1842b *) should be (* Bug #14842b *)
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In the second issue described in #14842, @smuenzel observed that the problem comes from an expansion being hidden by the use of
Subst.type_expr.While this may be hiding a deeper problem of wrong handling of scopes, this PR fixes the problem by replacing this use of
Subst.type_exprbywith_local_level_generalize_structure/Ctype.instance. Arguably, this makes sense because all newtypes can only occur at a generalizable level.