Fix ICE in msg_span_from_free_region on ReEmpty #55638
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r? @estebank (rust_highfive has picked a reviewer for you, use r? to override) |
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looking at the regression test and the resulting error diagnostic, you might well ask: "Where is the lifetime coming from that is being captured? Should we be accepting this code rather than erroring?" And these are good questions. |
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@bors r+ rollup |
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📌 Commit cc33aec has been approved by |
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kennytm
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Nov 8, 2018
…g_span_from_free_region, r=estebank
Fix ICE in msg_span_from_free_region on ReEmpty
On an example like this:
```rust
#![feature(conservative_impl_trait)]
fn server() -> impl FilterBase2 {
segment2(|| { loop { } }).map2(|| "")
}
trait FilterBase2 {
fn map2<F>(self, _fn: F) -> Map2<F> where Self: Sized { loop { } }
}
struct Map2<F> { _func: F }
impl<F> FilterBase2 for Map2<F> { }
fn segment2<F>(_fn: F) -> Map2<F> where F: Fn() -> Result<(), ()> {
loop { }
}
```
we now, instead of ICE'ing, get a diagnostic like:
```
error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
--> issue-55608.rs:3:16
|
3 | fn server() -> impl FilterBase2 {
| ^^^^^^^^^^^^^^^^
|
= note: hidden type `Map2<[[email protected]:4:36: 4:41]>` captures an empty lifetime
```
Fix rust-lang#55608
Mark-Simulacrum
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to Mark-Simulacrum/rust
that referenced
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Nov 9, 2018
…g_span_from_free_region, r=estebank
Fix ICE in msg_span_from_free_region on ReEmpty
On an example like this:
```rust
#![feature(conservative_impl_trait)]
fn server() -> impl FilterBase2 {
segment2(|| { loop { } }).map2(|| "")
}
trait FilterBase2 {
fn map2<F>(self, _fn: F) -> Map2<F> where Self: Sized { loop { } }
}
struct Map2<F> { _func: F }
impl<F> FilterBase2 for Map2<F> { }
fn segment2<F>(_fn: F) -> Map2<F> where F: Fn() -> Result<(), ()> {
loop { }
}
```
we now, instead of ICE'ing, get a diagnostic like:
```
error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
--> issue-55608.rs:3:16
|
3 | fn server() -> impl FilterBase2 {
| ^^^^^^^^^^^^^^^^
|
= note: hidden type `Map2<[[email protected]:4:36: 4:41]>` captures an empty lifetime
```
Fix rust-lang#55608
bors
added a commit
that referenced
this pull request
Nov 9, 2018
Rollup of 17 pull requests Successful merges: - #55576 (Clarify error message for -C opt-level) - #55633 (Support memcpy/memmove with differing src/dst alignment) - #55638 (Fix ICE in msg_span_from_free_region on ReEmpty) - #55659 (rustc: Delete grouping logic from the musl target) - #55719 (Sidestep link error from rustfix'ed code by using a *defined* static.) - #55736 (Elide anon lifetimes in conflicting impl note) - #55739 (Consume optimization fuel from the MIR inliner) - #55742 (Avoid panic when matching function call) - #55753 (borrow_set: remove a helper function and a clone it uses) - #55755 (Improve creation of 3 IndexVecs) - #55758 ([regression - rust2018]: unused_mut lint false positives on nightly) - #55760 (Remove intermediate font specs) - #55761 (mir: remove a hacky recursive helper function) - #55774 (wasm32-unknown-emscripten expects the rust_eh_personality symbol) - #55777 (Use `Lit` rather than `P<Lit>` in `ast::ExprKind`.) - #55783 (Deprecate mpsc channel selection) - #55788 (rustc: Request ansi colors if stderr isn't a tty) Failed merges: r? @ghost
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On an example like this:
we now, instead of ICE'ing, get a diagnostic like:
Fix #55608