Commits on Apr 11, 2022

1. Add SequenceValue for heterogeneous sequences …

   PEP 646 requires that we support heterogeneous, variable-length
   sequences like tuple[int, *tuple[str, ...]]. This requires replacing
   the SequenceIncompleteValue class, so we're doing this in steps:
   
   1. Add SequenceValue and accept it in all places that currently
      accept SequenceIncompleteValue, but don't infer it in any
      existing contexts (this PR).
   2. Update internal usages of SequenceIncompleteValue to also accept
      SequenceValue.
   3. Infer only SequenceValue inside pyanalyze.
   4. Remove internal usage of SequenceIncompleteValue.
   5. Drop SequenceIncompleteValue.

   

   JelleZijlstra committed Apr 11, 2022
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2. formatting fixes

   

   JelleZijlstra committed Apr 11, 2022
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3. Fix 3.6

   

   JelleZijlstra committed Apr 11, 2022
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4. extra f

   

   JelleZijlstra committed Apr 11, 2022
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