Implement beginnings of generics

 - add HIR for generic params
 - resolve generic params in type paths
 - add substitions for ADTs
 - insert type variables for substitutions

2 files changed, 5 insertions, 2 deletions

diff --git a/crates/ra_ide_api/src/completion/complete_dot.rs b/crates/ra_ide_api/src/completion/complete_dot.rs
index 473edc50e..76c2f8173 100644
--- a/crates/ra_ide_api/src/completion/complete_dot.rs
+++ b/crates/ra_ide_api/src/completion/complete_dot.rs
@@ -24,7 +24,9 @@ pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
 fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty) {
     for receiver in receiver.autoderef(ctx.db) {
         match receiver {
-            Ty::Adt { def_id, .. } => {
+            Ty::Adt {
+                def_id, ref substs, ..
+            } => {
                 match def_id.resolve(ctx.db) {
                     Def::Struct(s) => {
                         for field in s.fields(ctx.db) {
@@ -33,7 +35,7 @@ fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty)
                                 field.name().to_string(),
                             )
                             .kind(CompletionItemKind::Field)
-                            .set_detail(field.ty(ctx.db).map(|ty| ty.to_string()))
+                            .set_detail(field.ty(ctx.db).map(|ty| ty.subst(substs).to_string()))
                             .add_to(acc);
                         }
                     }
diff --git a/crates/ra_ide_api/src/db.rs b/crates/ra_ide_api/src/db.rs
index c2978f909..d53919973 100644
--- a/crates/ra_ide_api/src/db.rs
+++ b/crates/ra_ide_api/src/db.rs
@@ -129,6 +129,7 @@ salsa::database_storage! {
             fn body_hir() for hir::db::BodyHirQuery;
             fn body_syntax_mapping() for hir::db::BodySyntaxMappingQuery;
             fn fn_signature() for hir::db::FnSignatureQuery;
+            fn generics() for hir::db::GenericsQuery;
         }
     }
 }