Subtyping backports for 1.9 #49032
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Subtyping backports for 1.9 #49032
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…ontaining typevars (JuliaLang#48221)"" This reverts commit 7d335a0.
skip checked `equal_union` by set `state[i] = 1`
…uliaLang#48441) * Avoid earsing `Runion` within nested `forall_exists_subtype` If `Runion.more != 0` we‘d better not erase the local `Runion` as we need it if the subtyping fails after. This commit replaces `forall_exists_subtype` with a local version. It first tries `forall_exists_subtype` and estimates the "problem scale". If subtyping fails and the scale looks small then it switches to the slow path. TODO: At present, the "problem scale" only counts the number of checked `Lunion`s. But perhaps we need a more accurate result (e.g. sum of `Runion.depth`) * Change the reversed subtyping into a local check. Make sure we don't forget the bound in `env`. (And we can fuse `local_forall_exists_subtype`) * Optimization for non-union invariant parameter.
If `y` has no free typevar. Then `x <: y` wont cause any env change. Thus there's no need to split `y`.
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This PR backports #48479, #48410, #48441, and #48603 to 1.9.
CC @KristofferC.