Variance checking for higher-kinded types #5100

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odersky opened this issue Sep 13, 2018 · 1 comment

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odersky commented Sep 13, 2018

Variance is currently not checked in higher-kinded types. The following lines should all give an error but don't:

  type F[-X] = X => X
  type G[+X] = X => X
  type H = [-X] => X => X
  type I = [+X] => X => X

odersky mentioned this issue

Add match type #4964

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smarter commented Sep 13, 2018

Duplicate of #1252

smarter marked this as a duplicate of #1252

smarter closed this as completed

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