León Orell Valerian Liehr cdc3d701cb

Don't reject *multiple* relaxed bounds, reject *duplicate* ones. ...

Having multiple relaxed bounds like `?Sized + ?Iterator` is actually *fine*.
We actually want to reject *duplicate* relaxed bounds like `?Sized + ?Sized`
because these most certainly represent a user error.

Note that this doesn't mean that we accept more code because a bound like
`?Iterator` is still invalid as it's not relaxing a *default* trait and
the only way to define / use more default bounds is under the experimental
and internal feature `more_maybe_bounds` plus `lang_items` plus unstable
flag `-Zexperimental-default-bounds` (historical context: for the longest
time, bounds like `?Iterator` were actually allowed and lead to a hard
warning).

Ultimately, this simply *reframes* the diagnostic. The scope of
`more_maybe_bounds` / `-Zexperimental-default-bounds` remains unchanged
as well.

2025-07-18 12:24:56 +02:00

..

src

Don't reject *multiple* relaxed bounds, reject *duplicate* ones.

2025-07-18 12:24:56 +02:00

Cargo.toml

Revert "Use workspace lints for crates in compiler/ #138084"

2025-03-10 18:12:47 +08:00