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Improve generic mapped type relations #13448

Merged
merged 3 commits into from
Jan 12, 2017
Merged

Improve generic mapped type relations #13448

merged 3 commits into from
Jan 12, 2017

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ahejlsberg
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@ahejlsberg ahejlsberg commented Jan 12, 2017 •
edited by DanielRosenwasser

This PR improves type relationships for generic mapped types: A mapped type { [P in S]: X } is related to a mapped type { [Q in T]: Y } if T is related to S and X' is related to Y, where X' is an instantiation of X in which P is replaced with Q. Notice that S and T are contra-variant whereas X and Y are co-variant.

Fixes #12832.

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@mhegazy Ping.

@ahejlsberg ahejlsberg merged commit 2711303 into master Jan 12, 2017
@ahejlsberg ahejlsberg deleted the fixMappedTypeRelations branch January 12, 2017 23:20
@ahejlsberg ahejlsberg mentioned this pull request Mar 12, 2017
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@ahejlsberg ahejlsberg mentioned this pull request Jul 22, 2017
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