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Revert some additions of free variables to type restrictions #11246

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HertzDevil
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Resolves #11244. Reverts part of #10467 where generic type restrictions like Foo were changed into Foo(T) forall T, as they are not equivalent.

@HertzDevil HertzDevil added kind:bug A bug in the code. Does not apply to documentation, specs, etc. kind:regression Something that used to correctly work but no longer works topic:stdlib:collection labels Sep 25, 2021
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Thank you!

@asterite
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It would be nice to have some specs so we make sure nobody adds them back again. Or maybe a comment in the source code.

@vlazar
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vlazar commented Sep 28, 2021

It looks reasonable to include in 1.2.0, since this fixes an issue from #10467 which is part of 1.2.0 milestone.

@beta-ziliani beta-ziliani added this to the 1.2.0 milestone Sep 28, 2021
@straight-shoota straight-shoota merged commit 4264636 into crystal-lang:master Sep 30, 2021
@HertzDevil HertzDevil deleted the bug/forall-restrictions branch September 30, 2021 10:13
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Error: undefined constant U
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