Skip to content
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 10 additions & 2 deletions compiler/rustc_infer/src/infer/lexical_region_resolve/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -438,7 +438,11 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
}
(VarValue::Value(a), VarValue::Empty(_)) => {
match *a {
ReLateBound(..) | ReErased | ReError(_) => {
// this is always on an error path,
// so it doesn't really matter if it's shorter or longer than an empty region
ReError(_) => false,

ReLateBound(..) | ReErased => {
bug!("cannot relate region: {:?}", a);
}

Expand Down Expand Up @@ -467,7 +471,11 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> {
}
(VarValue::Empty(a_ui), VarValue::Value(b)) => {
match *b {
ReLateBound(..) | ReErased | ReError(_) => {
// this is always on an error path,
// so it doesn't really matter if it's shorter or longer than an empty region
ReError(_) => false,

ReLateBound(..) | ReErased => {
bug!("cannot relate region: {:?}", b);
}

Expand Down
13 changes: 13 additions & 0 deletions tests/ui/lifetimes/issue-107988.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
pub trait TraitEngine<'tcx>: 'tcx {}

pub trait TraitEngineExt<'tcx> {
fn register_predicate_obligations(&mut self);
}

impl<T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
//~^ ERROR use of undeclared lifetime name `'tcx`
//~| ERROR use of undeclared lifetime name `'tcx`
fn register_predicate_obligations(&mut self) {}
}

fn main() {}
27 changes: 27 additions & 0 deletions tests/ui/lifetimes/issue-107988.stderr
Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
error[E0261]: use of undeclared lifetime name `'tcx`
--> $DIR/issue-107988.rs:7:52
|
LL | impl<T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
| - ^^^^ undeclared lifetime
| |
| help: consider introducing lifetime `'tcx` here: `'tcx,`

error[E0261]: use of undeclared lifetime name `'tcx`
--> $DIR/issue-107988.rs:7:30
|
LL | impl<T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
| ^^^^ undeclared lifetime
|
= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'tcx` lifetime
|
LL | impl<T: ?Sized + for<'tcx> TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
| +++++++++
help: consider introducing lifetime `'tcx` here
|
LL | impl<'tcx, T: ?Sized + TraitEngine<'tcx>> TraitEngineExt<'tcx> for T {
| +++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0261`.