Commits on May 16, 2022

1. checkexpr: cache type of container literals when possible …

   When a container (list, set, tuple, or dict) literal expression is
   used as an argument to an overloaded function it will get repeatedly
   typechecked. This becomes particularly problematic when the expression
   is somewhat large, as seen in python#9427
   
   To avoid repeated work, add a new cache in ExprChecker, mapping the AST
   node to the resolved type of the expression. Right now the cache is
   only used in the fast path, although it could conceivably be leveraged
   for the slow path as well in a follow-up commit.
   
   To further reduce duplicate work, when the fast-path doesn't work, we
   use the cache to make a note of that, to avoid repeatedly attempting to
   take the fast path.
   
   Fixes python#9427

   

   huguesb committed May 16, 2022
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