Fix implicit closure return type generation for libsyntax #49279
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…lambda-building This prevents explicit `-> _` return type annotations for closures generated by `lambda`.
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Ping from triage @michaelwoerister! This PR needs your review. |
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r? @alexcrichton maybe? |
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@bors: r+ |
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Mar 27, 2018
…ichton Fix implicit closure return type generation for libsyntax The `lambda` function for constructing closures in libsyntax was explicitly setting the return type to `_`, which resulted in incorrect corresponding syntax (as `|| -> _ x` is not valid, without the enclosing brackets). This meant the generated code, when printed, was invalid. I also took the opportunity to slightly improve the generated code for the `RustcEncodable::encode` method for unit structs. Fixes #42213.
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☀️ Test successful - status-appveyor, status-travis |
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The
lambdafunction for constructing closures in libsyntax was explicitly setting the return type to_, which resulted in incorrect corresponding syntax (as|| -> _ xis not valid, without the enclosing brackets). This meant the generated code, when printed, was invalid.I also took the opportunity to slightly improve the generated code for the
RustcEncodable::encodemethod for unit structs.Fixes #42213.