[beta] ICE fixes for newly stabilized features #49948
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(Do not merge yet - #49830 is still waiting to be merged into master.)This PR beta-backports PRs for fixing ICEs caused by the features that will be stabilized in the next release.
main
's return type containing lifetimes #49692:fn main() -> Result<(), Box<std::error::Error>>
causes ICE-> impl Trait
functions causes ICEimpl Trait
in unsupported position #49830: placingimpl Trait
in invalid positions causes ICE