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Fix #3470: Fix NPE when TypeVar tries to instantiate already instantiated variab… #3472

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nerush
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@nerush nerush commented Nov 14, 2017

  1. Fix NPE when TypeVar tries to instantiate already instantiated variable with given type.
  2. Remove unused imports
  3. Fix typos

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Hello, and thank you for opening this PR! 🎉

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@OlivierBlanvillain
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Thanks for the PR! Do you have a test case that generates a NPE here?

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nerush commented Nov 15, 2017

@OlivierBlanvillain Simply forgot to add it. Shall I add it to dotty.tools.ErrorMessagesTests ?

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OlivierBlanvillain commented Nov 15, 2017

Put it in tests/pos/i3470.scala, or in tests/run/ if it's executable (or in tests/neg/ if it's a test that shouldn't compile 😄)

@nerush nerush force-pushed the fix/npe-in-type-inference branch from 1a50c45 to 3433789 Compare November 15, 2017 18:09
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nerush commented Nov 15, 2017

@OlivierBlanvillain unit test is in tests/neg, as it should not be compilable.

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The fixes to imports and comments are all very welcome. But I am not sure about the core of the change, to test for owningState != null. Such a test is usually a code smell. If we do accept that in the code base we'd need a comment that explains why owningState could be null at this point.

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odersky commented Jan 1, 2018

Superseded by #3726.

@odersky odersky closed this Jan 1, 2018
@nerush nerush deleted the fix/npe-in-type-inference branch January 2, 2018 12:03
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4 participants