Add a feature gate for nested uses of impl Trait
#46888
Conversation
kennytm
added
the
S-waiting-on-review
|
|
||
| use std::fmt::Debug; | ||
|
|
||
| fn fine(x: impl Into<u32>) -> impl Into<u32> { x } |
There was a problem hiding this comment.
can we add a test for fn bad(x: impl Into<impl Debug>) -- it occurs to me that nested syntax in this position is also "not great" for the same reason. Though perhaps a mite less bad in that it's more clear how we would allow those types to be specified in the future.
There was a problem hiding this comment.
Oh, I purposefully made that work, so that test would fail. I will make the change.
cramertj
force-pushed
the
nested-impl-trait-error
branch
from
4f8f8dd to
99a1460
Compare
|
@bors r+ |
|
📌 Commit 99a1460 has been approved by |
kennytm
added
S-waiting-on-bors
|
☔ The latest upstream changes (presumably #46531) made this pull request unmergeable. Please resolve the merge conflicts. |
cramertj
force-pushed
the
nested-impl-trait-error
branch
from
99a1460 to
c026d19
Compare
|
@bors r+ |
|
📌 Commit c026d19 has been approved by |
…=nikomatsakis Add a feature gate for nested uses of `impl Trait` This allows us to delay stabilization of nested `impl Trait` until we have a plan to solve the problem posed [here](rust-lang#34511 (comment)). r? @nikomatsakis
…=nikomatsakis Add a feature gate for nested uses of `impl Trait` This allows us to delay stabilization of nested `impl Trait` until we have a plan to solve the problem posed [here](rust-lang#34511 (comment)). r? @nikomatsakis
Add a feature gate for nested uses of `impl Trait` This allows us to delay stabilization of nested `impl Trait` until we have a plan to solve the problem posed [here](#34511 (comment)). r? @nikomatsakis
|
☀️ Test successful - status-appveyor, status-travis |
This allows us to delay stabilization of nested
impl Traituntil we have a plan to solve the problem posed here.r? @nikomatsakis