Fix #5422: prefer type tp1 in Typ(tp1) - Prod(tp2, ...) #5425
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In `Typ(tp1) - Prod(tp2, ...)` with `tp1 <: tp2`, we rewrite `Typ(tp1)` to `Prod(tpx, Nil)`. We should prefer `tp1` over `tp2`, as the latter is usually a bigger space, due to the erasure of pattern bound symbol references during pattern-space projection.
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Fix #5422: prefer type tp1 in Typ(tp1) - Prod(tp2, ...)
In
Typ(tp1) - Prod(tp2, ...)withtp1 <: tp2, we rewriteTyp(tp1)toProd(tpx, Nil). We should prefertp1overtp2, as the latter is usually a bigger space, due to theerasure of pattern bound symbol references during
pattern-space projection.