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nested isinstances lose type information #10146

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@Akuli

Description

@Akuli

Bug Report

To Reproduce

x = object()
if isinstance(x, (int, str)):
    reveal_type(x)      # Union[int, str]
    if isinstance(x, int):
        pass
    reveal_type(x)      # object

Expected Behavior

both types revealed as Union[int, str]

Actual Behavior

object from second type

Your Environment

  • Mypy version used: latest master (0.820+dev.72ac2cee910ca61bfdf449217328b6d10b45d378)
  • Mypy command-line flags: none
  • Mypy configuration options from mypy.ini (and other config files): none
  • Python version used: 3.7.3
  • Operating system and version: debian 10 based linux distro

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