2 files changed, 17 insertions, 1 deletions

diff --git a/crates/ra_ide_db/Cargo.toml b/crates/ra_ide_db/Cargo.toml
index c3921bd40..b14206c9b 100644
--- a/crates/ra_ide_db/Cargo.toml
+++ b/crates/ra_ide_db/Cargo.toml
@@ -24,6 +24,7 @@ ra_text_edit = { path = "../ra_text_edit" }
 ra_db = { path = "../ra_db" }
 ra_prof = { path = "../ra_prof" }
 test_utils = { path = "../test_utils" }
+ra_hir_def = { path = "../ra_hir_def" }
 
 # ra_ide should depend only on the top-level `hir` package. if you need
 # something from some `hir_xxx` subpackage, reexport the API via `hir`.
diff --git a/crates/ra_ide_db/src/defs.rs b/crates/ra_ide_db/src/defs.rs
index 3ef5e74b6..a158169e3 100644
--- a/crates/ra_ide_db/src/defs.rs
+++ b/crates/ra_ide_db/src/defs.rs
@@ -7,7 +7,7 @@
 
 use hir::{
     Field, HasVisibility, ImplDef, Local, MacroDef, Module, ModuleDef, Name, PathResolution,
-    Semantics, TypeParam, Visibility,
+    Semantics, TypeParam, Visibility, db::{DefDatabase, HirDatabase},
 };
 use ra_prof::profile;
 use ra_syntax::{
@@ -16,6 +16,7 @@ use ra_syntax::{
 };
 
 use crate::RootDatabase;
+use ra_hir_def::resolver::{Resolver, HasResolver};
 
 // FIXME: a more precise name would probably be `Symbol`?
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
@@ -76,6 +77,20 @@ impl Definition {
         };
         Some(name)
     }
+
+    pub fn resolver<D: HirDatabase + DefDatabase>(&self, db: &D) -> Option<Resolver> {
+        use hir::VariantDef;
+        use ra_hir_def::*;
+        Some(match self {
+            Definition::ModuleDef(def) => def.resolver(db)?,
+            Definition::Field(field) => Into::<VariantId>::into(Into::<VariantDef>::into(field.parent_def(db))).resolver(db),
+            Definition::Macro(m) => Into::<ModuleId>::into(m.module(db)?).resolver(db),
+            Definition::SelfType(imp) => Into::<ImplId>::into(imp.clone()).resolver(db),
+            // it's possible, read probable, that other arms of this are also unreachable
+            Definition::Local(_local) => unreachable!(),
+            Definition::TypeParam(tp) => Into::<ModuleId>::into(tp.module(db)).resolver(db)
+        })
+    }
 }
 
 #[derive(Debug)]