Infer argument types for unboxed closures by inspecting the expected type #19089
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…h the fulfillment contect if necessary.
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@nikomatsakis Tidy error: |
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Closing in favor of #19113. |
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…ation, r=acrichto Use the expected type to infer the argument/return types of unboxed closures. Also, in `||` expressions, use the expected type to decide if the result should be a boxed or unboxed closure (and if an unboxed closure, what kind). This supercedes PR #19089, which was already reviewed by @pcwalton.
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This also lays the groundwork for a simple version of inference to decide on
FnOncevsFnMutetc.Fixes #17907
r? @pcwalton