diff --git a/src/librustc/infer/lexical_region_resolve/mod.rs b/src/librustc/infer/lexical_region_resolve/mod.rs index d06c4434b3aaf..4bfe953e45c0b 100644 --- a/src/librustc/infer/lexical_region_resolve/mod.rs +++ b/src/librustc/infer/lexical_region_resolve/mod.rs @@ -764,16 +764,17 @@ impl<'cx, 'tcx> LexicalResolver<'cx, 'tcx> { } } - span_bug!( + // Errors in earlier passes can yield error variables without + // resolution errors here; delay ICE in favor of those errors. + self.tcx().sess.delay_span_bug( self.var_infos[node_idx].origin.span(), - "collect_error_for_expanding_node() could not find \ - error for var {:?} in universe {:?}, lower_bounds={:#?}, \ - upper_bounds={:#?}", - node_idx, - node_universe, - lower_bounds, - upper_bounds - ); + &format!("collect_error_for_expanding_node() could not find \ + error for var {:?} in universe {:?}, lower_bounds={:#?}, \ + upper_bounds={:#?}", + node_idx, + node_universe, + lower_bounds, + upper_bounds)); } fn collect_concrete_regions( diff --git a/src/test/ui/hrtb/issue-62203-hrtb-ice.rs b/src/test/ui/hrtb/issue-62203-hrtb-ice.rs new file mode 100644 index 0000000000000..454d7e5e9cdea --- /dev/null +++ b/src/test/ui/hrtb/issue-62203-hrtb-ice.rs @@ -0,0 +1,50 @@ +trait T0<'a, A> { + type O; +} + +struct L { + f: T, +} + +// explicitly named variants of what one would normally denote by the +// unit type `()`. Why do this? So that we can differentiate them in +// the diagnostic output. +struct Unit1; +struct Unit2; +struct Unit3; +struct Unit4; + +impl<'a, A, T> T0<'a, A> for L +where + T: FnMut(A) -> Unit3, +{ + type O = T::Output; +} + +trait T1: for<'r> Ty<'r> { + fn m<'a, B: Ty<'a>, F>(&self, f: F) -> Unit1 + where + F: for<'r> T0<'r, (>::V,), O = >::V>, + { + unimplemented!(); + } +} + +trait Ty<'a> { + type V; +} + +fn main() { + let v = Unit2.m( + //~^ ERROR type mismatch + //~| ERROR type mismatch + L { + f : |x| { drop(x); Unit4 } + }); +} + +impl<'a> Ty<'a> for Unit2 { + type V = &'a u8; +} + +impl T1 for Unit2 {} diff --git a/src/test/ui/hrtb/issue-62203-hrtb-ice.stderr b/src/test/ui/hrtb/issue-62203-hrtb-ice.stderr new file mode 100644 index 0000000000000..c2d0e0c2a26bc --- /dev/null +++ b/src/test/ui/hrtb/issue-62203-hrtb-ice.stderr @@ -0,0 +1,22 @@ +error[E0271]: type mismatch resolving `for<'r> as T0<'r, (>::V,)>>::O == <_ as Ty<'r>>::V` + --> $DIR/issue-62203-hrtb-ice.rs:38:19 + | +LL | let v = Unit2.m( + | ^ expected struct `Unit4`, found associated type + | + = note: expected type `Unit4` + found type `<_ as Ty<'_>>::V` + +error[E0271]: type mismatch resolving `<[closure@$DIR/issue-62203-hrtb-ice.rs:42:17: 42:39] as std::ops::FnOnce<((&u8,),)>>::Output == Unit3` + --> $DIR/issue-62203-hrtb-ice.rs:38:19 + | +LL | let v = Unit2.m( + | ^ expected struct `Unit4`, found struct `Unit3` + | + = note: expected type `Unit4` + found type `Unit3` + = note: required because of the requirements on the impl of `for<'r> T0<'r, (>::V,)>` for `L<[closure@$DIR/issue-62203-hrtb-ice.rs:42:17: 42:39]>` + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0271`.