rust manual: supertraits seperator is wrong#14465
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Limited syntax support for return type notations (RTN) Experimental RTN bound support was recently merged into rustc (rust-lang#109417), the goal of this PR is to allow experimentation without syntax errors everywhere. The parsing implemented currently aligns with the state of the tracking issue, it only supports the form `T<foo(..): Bounds>`. The parser always checks for the presence of `..` to disambiguate from `Fn*()` types, this is not ideal but I didn't want to spend too much time as it is an experimental feature.
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…=Veykril Parse associated return type bounds This PR implements parser support for associated return type bounds: `T: Foo<bar(): Send>`. This PR does not implement associated return types (`T::bar(): Send`) because it's not implemented even in rustc, and also removes `(..)`-style return type notation because it has been removed in rust-lang#110203 (effectively reverting rust-lang#14465). I don't plan to proactively follow this unstable feature unless an RFC is accepted and my main motivation here is to remove no-longer-valid syntax `(..)` from our parser, nevertheless adding minimal parser support so anyone interested (as can be seen in rust-lang#14465) can experiment it without rust-analyzer's syntax errors.
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Fix rust-lang#14465 changelog: none
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