Rollup of 6 pull requests#156140

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jhpratt wants to merge 17 commits intorust-lang:mainfrom

jhpratt:rollup-tW55BUD

Commits on Apr 20, 2026

docs(unstable-book): Document const generics features
popzxc
committed
Update unstable feature descriptions (min_generic_const_args, generic_const_exprs)
popzxc
committed
Change generic_const_args feature from unstable to incomplete
popzxc
committed

Commits on Apr 23, 2026

Do not use `const { }` blocks for GCI

popzxc
and
fmease
committed

Commits on May 3, 2026

Relax `T: Sized` bound on `try_as_dyn` / `try_as_dyn_mut`
aobatact
committed

Commits on May 4, 2026