Auto merge of #781 - lowr:fix/integration-adt-with-proper-subst, r=jackh726

fix: consider ADT's generic parameters

Fixes #762

chalk-integration has been overlooking ADTs' generic parameters when it generates auto trait impls for them. This function is only used to print the lowered program in cli so it doesn't affect other crates.

Author: bors

chalk-integration/src/query.rs

@@ -8,7 +8,7 @@ use crate::program::Program;
 use crate::program_environment::ProgramEnvironment;
 use crate::tls;
 use crate::SolverChoice;
-use chalk_ir::{Substitution, TraitId};
+use chalk_ir::TraitId;
 use chalk_solve::clauses::builder::ClauseBuilder;
 use chalk_solve::clauses::program_clauses::ToProgramClauses;
 use chalk_solve::coherence::orphan;
@@ -224,11 +224,13 @@ fn environment(db: &dyn LoweringDatabase) -> Result<Arc<ProgramEnvironment>, Cha
         .iter()
         .filter(|(_, auto_trait)| auto_trait.is_auto_trait())
     {
-        for &adt_id in program.adt_data.keys() {
-            let ty = chalk_ir::TyKind::Adt(adt_id, Substitution::empty(builder.interner()));
-            chalk_solve::clauses::push_auto_trait_impls(builder, auto_trait_id, &ty)
-                .map_err(|_| ())
-                .unwrap();
+        for adt_datum in program.adt_data.values() {
+            builder.push_binders(adt_datum.binders.clone(), |builder, _| {
+                let ty = chalk_ir::TyKind::Adt(adt_datum.id, builder.substitution_in_scope());
+                chalk_solve::clauses::push_auto_trait_impls(builder, auto_trait_id, &ty)
+                    .map_err(|_| ())
+                    .unwrap();
+            });
         }
     }