diff --git a/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs b/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs index 441cfeea20a48..e9d5ebad7de03 100644 --- a/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs +++ b/compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs @@ -39,6 +39,14 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> { ) if **sub_r == RegionKind::ReStatic => { // This is for an implicit `'static` requirement coming from `impl dyn Trait {}`. if let ObligationCauseCode::UnifyReceiver(ctxt) = &cause.code { + // This may have a closure and it would cause ICE + // through `find_param_with_region` (#78262). + let anon_reg_sup = tcx.is_suitable_region(sup_r)?; + let fn_returns = tcx.return_type_impl_or_dyn_traits(anon_reg_sup.def_id); + if fn_returns.is_empty() { + return None; + } + let param = self.find_param_with_region(sup_r, sub_r)?; let lifetime = if sup_r.has_name() { format!("lifetime `{}`", sup_r) diff --git a/src/test/ui/regions/issue-78262.default.stderr b/src/test/ui/regions/issue-78262.default.stderr new file mode 100644 index 0000000000000..e97b8eca94892 --- /dev/null +++ b/src/test/ui/regions/issue-78262.default.stderr @@ -0,0 +1,18 @@ +error[E0308]: mismatched types + --> $DIR/issue-78262.rs:12:28 + | +LL | let f = |x: &dyn TT| x.func(); + | ^^^^ lifetime mismatch + | + = note: expected reference `&(dyn TT + 'static)` + found reference `&dyn TT` +note: the anonymous lifetime #1 defined on the body at 12:13... + --> $DIR/issue-78262.rs:12:13 + | +LL | let f = |x: &dyn TT| x.func(); + | ^^^^^^^^^^^^^^^^^^^^^ + = note: ...does not necessarily outlive the static lifetime + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0308`. diff --git a/src/test/ui/regions/issue-78262.nll.stderr b/src/test/ui/regions/issue-78262.nll.stderr new file mode 100644 index 0000000000000..4607dbad4220b --- /dev/null +++ b/src/test/ui/regions/issue-78262.nll.stderr @@ -0,0 +1,10 @@ +error[E0521]: borrowed data escapes outside of closure + --> $DIR/issue-78262.rs:12:26 + | +LL | let f = |x: &dyn TT| x.func(); + | - ^^^^^^^^ `x` escapes the closure body here + | | + | `x` is a reference that is only valid in the closure body + +error: aborting due to previous error + diff --git a/src/test/ui/regions/issue-78262.rs b/src/test/ui/regions/issue-78262.rs new file mode 100644 index 0000000000000..0bdb0abac307d --- /dev/null +++ b/src/test/ui/regions/issue-78262.rs @@ -0,0 +1,14 @@ +// revisions: nll default +// ignore-compare-mode-nll +//[nll]compile-flags: -Z borrowck=mir + +trait TT {} + +impl dyn TT { + fn func(&self) {} +} + +fn main() { + let f = |x: &dyn TT| x.func(); //[default]~ ERROR: mismatched types + //[nll]~^ ERROR: borrowed data escapes outside of closure +}