Ensure distributive constraints of restrictive instantiations of type parameters don't exist#47091
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… parameters dont exist
typescript-bot
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What is a "restrictive instantiation"? #46761 doesn't mention that term, and I've personally never heard of it. Is it some kind of internal implementation detail? |
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It's definitely an implementation detail. It's part of how we check if no instantiation of one thing is assignable to another thing. |
RyanCavanaugh
approved these changes
Sep 27, 2022
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@weswigham I'm going through all the ready-to-merge PRs, and this one is signed off. Is it worth bringing up to date and merging it for 5.1? |
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All right, this is old and looks like it's obsolete, so I'm going to close it. |
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Since restrictive instantiations replace type parameter constraints with
unknown, if we use them to calculate a distributive constraint, we produce very wrong results. So we try to see if we're looking at such an instantiation when calculating a distributive constraint now, and choose to not yield a constraint if that is the case.Fixes #46761