3 files changed, 11 insertions, 9 deletions

diff --git a/crates/ra_analysis/src/descriptors/function/imp.rs b/crates/ra_analysis/src/descriptors/function/imp.rs
index a989a04cd..a7257acf9 100644
--- a/crates/ra_analysis/src/descriptors/function/imp.rs
+++ b/crates/ra_analysis/src/descriptors/function/imp.rs
@@ -8,9 +8,9 @@ use crate::descriptors::{
 };
 
 /// Resolve `FnId` to the corresponding `SyntaxNode`
-/// TODO: this should return something more type-safe then `SyntaxNode`
 pub(crate) fn fn_syntax(db: &impl DescriptorDatabase, fn_id: FnId) -> FnDefNode {
-    let syntax = db.resolve_syntax_ptr(fn_id.0);
+    let ptr = db.id_maps().fn_ptr(fn_id);
+    let syntax = db.resolve_syntax_ptr(ptr);
     FnDef::cast(syntax.borrowed()).unwrap().owned()
 }
 
diff --git a/crates/ra_analysis/src/descriptors/function/mod.rs b/crates/ra_analysis/src/descriptors/function/mod.rs
index d5db28a64..86eee5e93 100644
--- a/crates/ra_analysis/src/descriptors/function/mod.rs
+++ b/crates/ra_analysis/src/descriptors/function/mod.rs
@@ -8,17 +8,18 @@ use ra_syntax::{
     TextRange, TextUnit,
 };
 
-use crate::{syntax_ptr::SyntaxPtr, FileId};
+use crate::{
+    syntax_ptr::SyntaxPtr, FileId,
+    loc2id::IdDatabase,
+};
 
 pub(crate) use self::scope::{resolve_local_name, FnScopes};
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub(crate) struct FnId(SyntaxPtr);
+pub(crate) use crate::loc2id::FnId;
 
 impl FnId {
-    pub(crate) fn new(file_id: FileId, fn_def: ast::FnDef) -> FnId {
+    pub(crate) fn get(db: &impl IdDatabase, file_id: FileId, fn_def: ast::FnDef) -> FnId {
         let ptr = SyntaxPtr::new(file_id, fn_def.syntax());
-        FnId(ptr)
+        db.id_maps().fn_id(ptr)
     }
 }
 
diff --git a/crates/ra_analysis/src/descriptors/mod.rs b/crates/ra_analysis/src/descriptors/mod.rs
index 56bde3849..d602c4e04 100644
--- a/crates/ra_analysis/src/descriptors/mod.rs
+++ b/crates/ra_analysis/src/descriptors/mod.rs
@@ -13,12 +13,13 @@ use crate::{
     descriptors::function::{resolve_local_name, FnId, FnScopes},
     descriptors::module::{ModuleId, ModuleScope, ModuleTree, ModuleSource},
     input::SourceRootId,
+    loc2id::IdDatabase,
     syntax_ptr::LocalSyntaxPtr,
     Cancelable,
 };
 
 salsa::query_group! {
-    pub(crate) trait DescriptorDatabase: SyntaxDatabase {
+    pub(crate) trait DescriptorDatabase: SyntaxDatabase + IdDatabase {
         fn module_tree(source_root_id: SourceRootId) -> Cancelable<Arc<ModuleTree>> {
             type ModuleTreeQuery;
             use fn module::imp::module_tree;