error: program clause dump
  --> $DIR/lower_trait_where_clause.rs:16:1
   |
LL | #[rustc_dump_program_clauses] //~ ERROR program clause dump
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: FromEnv(S: std::fmt::Debug) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: FromEnv(S: std::marker::Sized) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: FromEnv(T: std::borrow::Borrow<U>) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: FromEnv(T: std::marker::Sized) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: Implemented(Self: Foo<'a, 'b, S, T, U>) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: RegionOutlives('a : 'b) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: TypeOutlives(U : 'b) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).
   = note: WellFormed(Self: Foo<'a, 'b, S, T, U>) :- Implemented(Self: Foo<'a, 'b, S, T, U>), WellFormed(S: std::marker::Sized), WellFormed(T: std::marker::Sized), WellFormed(S: std::fmt::Debug), WellFormed(T: std::borrow::Borrow<U>), RegionOutlives('a : 'b), TypeOutlives(U : 'b), WellFormed(std::vec::Vec<T>).
   = note: WellFormed(std::vec::Vec<T>) :- FromEnv(Self: Foo<'a, 'b, S, T, U>).

error: aborting due to previous error