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Support user-defined type guard functions #1203

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ddfisher opened this issue Feb 2, 2016 · 1 comment
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Support user-defined type guard functions #1203

ddfisher opened this issue Feb 2, 2016 · 1 comment
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needs discussion priority-2-low

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@ddfisher
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ddfisher commented Feb 2, 2016

Currently we special case isinstance checks for determining the local type of a variable, but we could potentially give user-defined functions the same capability. See: microsoft/TypeScript#1007
@ddfisher ddfisher added this to the Future milestone Mar 1, 2016
@gvanrossum gvanrossum removed this from the Future milestone Mar 29, 2017
@elazarg elazarg mentioned this issue Apr 25, 2017
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This was referenced Oct 4, 2017
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@elazarg elazarg mentioned this issue Jun 13, 2018
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@ilevkivskyi
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Closing in favour of #5206 that has more discussion.

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