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`TypeMapping` is no longer cow-shaped. Before, `TypeMapping` defined a `to_owned` method, which would make an owned copy of the type mapping. This let us apply type mappings to function literals lazily. The primary part of a function that you have to apply the type mapping to is its signature. The hypothesis was that doing this lazily would prevent us from constructing the signature of a function just to apply a type mapping; if you never ended up needed the updated function signature, that would be extraneous work. But looking at the CI for this PR, it looks like that hypothesis is wrong! And this definitely cleans up the code quite a bit. It also means that over time we can consider replacing all of these `TypeMapping` enum variants with separate `TypeTransformer` impls. --------- Co-authored-by: David Peter <mail@david-peter.de> |
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