diff --git a/crates/assists/src/handlers/add_lifetime_to_type.rs b/crates/assists/src/handlers/add_lifetime_to_type.rs
new file mode 100644
index 000000000000..c1603e9722a3
--- /dev/null
+++ b/crates/assists/src/handlers/add_lifetime_to_type.rs
@@ -0,0 +1,228 @@
+use ast::FieldList;
+use syntax::ast::{self, AstNode, GenericParamsOwner, NameOwner, RefType, Type};
+
+use crate::{AssistContext, AssistId, AssistKind, Assists};
+
+// Assist: add_lifetime_to_type
+//
+// Adds a new lifetime to a struct, enum or union.
+//
+// ```
+// struct Point {
+//     x: &$0u32,
+//     y: u32,
+// }
+// ```
+// ->
+// ```
+// struct Point<'a> {
+//     x: &'a u32,
+//     y: u32,
+// }
+// ```
+pub(crate) fn add_lifetime_to_type(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
+    let ref_type_focused = ctx.find_node_at_offset::<ast::RefType>()?;
+    if ref_type_focused.lifetime().is_some() {
+        return None;
+    }
+
+    let node = ctx.find_node_at_offset::<ast::AdtDef>()?;
+    let has_lifetime = node
+        .generic_param_list()
+        .map(|gen_list| gen_list.lifetime_params().count() > 0)
+        .unwrap_or_default();
+
+    if has_lifetime {
+        return None;
+    }
+
+    let ref_types = fetch_borrowed_types(&node)?;
+    let target = node.syntax().text_range();
+
+    acc.add(
+        AssistId("add_lifetime_to_type", AssistKind::Generate),
+        "Add lifetime`",
+        target,
+        |builder| {
+            match node.generic_param_list() {
+                Some(gen_param) => {
+                    if let Some(left_angle) = gen_param.l_angle_token() {
+                        builder.insert(left_angle.text_range().end(), "'a, ");
+                    }
+                }
+                None => {
+                    if let Some(name) = node.name() {
+                        builder.insert(name.syntax().text_range().end(), "<'a>");
+                    }
+                }
+            }
+
+            for ref_type in ref_types {
+                if let Some(amp_token) = ref_type.amp_token() {
+                    builder.insert(amp_token.text_range().end(), "'a ");
+                }
+            }
+        },
+    )
+}
+
+fn fetch_borrowed_types(node: &ast::AdtDef) -> Option<Vec<RefType>> {
+    let ref_types: Vec<RefType> = match node {
+        ast::AdtDef::Enum(enum_) => {
+            let variant_list = enum_.variant_list()?;
+            variant_list
+                .variants()
+                .filter_map(|variant| {
+                    let field_list = variant.field_list()?;
+
+                    find_ref_types_from_field_list(&field_list)
+                })
+                .flatten()
+                .collect()
+        }
+        ast::AdtDef::Struct(strukt) => {
+            let field_list = strukt.field_list()?;
+            find_ref_types_from_field_list(&field_list)?
+        }
+        ast::AdtDef::Union(un) => {
+            let record_field_list = un.record_field_list()?;
+            record_field_list
+                .fields()
+                .filter_map(|r_field| {
+                    if let Type::RefType(ref_type) = r_field.ty()? {
+                        if ref_type.lifetime().is_none() {
+                            return Some(ref_type);
+                        }
+                    }
+
+                    None
+                })
+                .collect()
+        }
+    };
+
+    if ref_types.is_empty() {
+        None
+    } else {
+        Some(ref_types)
+    }
+}
+
+fn find_ref_types_from_field_list(field_list: &FieldList) -> Option<Vec<RefType>> {
+    let ref_types: Vec<RefType> = match field_list {
+        ast::FieldList::RecordFieldList(record_list) => record_list
+            .fields()
+            .filter_map(|f| {
+                if let Type::RefType(ref_type) = f.ty()? {
+                    if ref_type.lifetime().is_none() {
+                        return Some(ref_type);
+                    }
+                }
+
+                None
+            })
+            .collect(),
+        ast::FieldList::TupleFieldList(tuple_field_list) => tuple_field_list
+            .fields()
+            .filter_map(|f| {
+                if let Type::RefType(ref_type) = f.ty()? {
+                    if ref_type.lifetime().is_none() {
+                        return Some(ref_type);
+                    }
+                }
+
+                None
+            })
+            .collect(),
+    };
+
+    if ref_types.is_empty() {
+        None
+    } else {
+        Some(ref_types)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::{check_assist, check_assist_not_applicable};
+
+    use super::*;
+
+    #[test]
+    fn add_lifetime_to_struct() {
+        check_assist(
+            add_lifetime_to_type,
+            "struct Foo { a: &$0i32 }",
+            "struct Foo<'a> { a: &'a i32 }",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "struct Foo { a: &$0i32, b: &usize }",
+            "struct Foo<'a> { a: &'a i32, b: &'a usize }",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "struct Foo { a: &$0i32, b: usize }",
+            "struct Foo<'a> { a: &'a i32, b: usize }",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "struct Foo<T> { a: &$0T, b: usize }",
+            "struct Foo<'a, T> { a: &'a T, b: usize }",
+        );
+
+        check_assist_not_applicable(add_lifetime_to_type, "struct Foo<'a> { a: &$0'a i32 }");
+        check_assist_not_applicable(add_lifetime_to_type, "struct Foo { a: &'a$0 i32 }");
+    }
+
+    #[test]
+    fn add_lifetime_to_enum() {
+        check_assist(
+            add_lifetime_to_type,
+            "enum Foo { Bar { a: i32 }, Other, Tuple(u32, &$0u32)}",
+            "enum Foo<'a> { Bar { a: i32 }, Other, Tuple(u32, &'a u32)}",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "enum Foo { Bar { a: &$0i32 }}",
+            "enum Foo<'a> { Bar { a: &'a i32 }}",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "enum Foo<T> { Bar { a: &$0i32, b: &T }}",
+            "enum Foo<'a, T> { Bar { a: &'a i32, b: &'a T }}",
+        );
+
+        check_assist_not_applicable(add_lifetime_to_type, "enum Foo<'a> { Bar { a: &$0'a i32 }}");
+        check_assist_not_applicable(add_lifetime_to_type, "enum Foo { Bar, $0Misc }");
+    }
+
+    #[test]
+    fn add_lifetime_to_union() {
+        check_assist(
+            add_lifetime_to_type,
+            "union Foo { a: &$0i32 }",
+            "union Foo<'a> { a: &'a i32 }",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "union Foo { a: &$0i32, b: &usize }",
+            "union Foo<'a> { a: &'a i32, b: &'a usize }",
+        );
+
+        check_assist(
+            add_lifetime_to_type,
+            "union Foo<T> { a: &$0T, b: usize }",
+            "union Foo<'a, T> { a: &'a T, b: usize }",
+        );
+
+        check_assist_not_applicable(add_lifetime_to_type, "struct Foo<'a> { a: &'a $0i32 }");
+    }
+}
diff --git a/crates/assists/src/lib.rs b/crates/assists/src/lib.rs
index 14178a6510f3..559b9651e800 100644
--- a/crates/assists/src/lib.rs
+++ b/crates/assists/src/lib.rs
@@ -108,6 +108,7 @@ mod handlers {
     pub(crate) type Handler = fn(&mut Assists, &AssistContext) -> Option<()>;
 
     mod add_explicit_type;
+    mod add_lifetime_to_type;
     mod add_missing_impl_members;
     mod add_turbo_fish;
     mod apply_demorgan;
@@ -164,6 +165,7 @@ pub(crate) fn all() -> &'static [Handler] {
         &[
             // These are alphabetic for the foolish consistency
             add_explicit_type::add_explicit_type,
+            add_lifetime_to_type::add_lifetime_to_type,
             add_turbo_fish::add_turbo_fish,
             apply_demorgan::apply_demorgan,
             auto_import::auto_import,
diff --git a/crates/assists/src/tests/generated.rs b/crates/assists/src/tests/generated.rs
index d48d063b4076..9aa807f10a8f 100644
--- a/crates/assists/src/tests/generated.rs
+++ b/crates/assists/src/tests/generated.rs
@@ -103,6 +103,25 @@ fn foo(&self) -> u32 {
     )
 }
 
+#[test]
+fn doctest_add_lifetime_to_type() {
+    check_doc_test(
+        "add_lifetime_to_type",
+        r#####"
+struct Point {
+    x: &$0u32,
+    y: u32,
+}
+"#####,
+        r#####"
+struct Point<'a> {
+    x: &'a u32,
+    y: u32,
+}
+"#####,
+    )
+}
+
 #[test]
 fn doctest_add_turbo_fish() {
     check_doc_test(
diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index aaa7013b66a6..c34a99d90bdf 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -281,7 +281,7 @@ pub(crate) fn new(krate: Crate, crate_module_id: LocalModuleId) -> Module {
 
     /// Name of this module.
     pub fn name(self, db: &dyn HirDatabase) -> Option<Name> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         let parent = def_map[self.id.local_id].parent?;
         def_map[parent].children.iter().find_map(|(name, module_id)| {
             if *module_id == self.id.local_id {
@@ -307,7 +307,7 @@ pub fn crate_root(self, db: &dyn HirDatabase) -> Module {
 
     /// Iterates over all child modules.
     pub fn children(self, db: &dyn HirDatabase) -> impl Iterator<Item = Module> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         let children = def_map[self.id.local_id]
             .children
             .iter()
@@ -318,7 +318,7 @@ pub fn children(self, db: &dyn HirDatabase) -> impl Iterator<Item = Module> {
 
     /// Finds a parent module.
     pub fn parent(self, db: &dyn HirDatabase) -> Option<Module> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         let parent_id = def_map[self.id.local_id].parent?;
         Some(self.with_module_id(parent_id))
     }
@@ -339,7 +339,7 @@ pub fn scope(
         db: &dyn HirDatabase,
         visible_from: Option<Module>,
     ) -> Vec<(Name, ScopeDef)> {
-        db.crate_def_map(self.id.krate)[self.id.local_id]
+        self.id.def_map(db.upcast())[self.id.local_id]
             .scope
             .entries()
             .filter_map(|(name, def)| {
@@ -362,14 +362,14 @@ pub fn scope(
     }
 
     pub fn visibility_of(self, db: &dyn HirDatabase, def: &ModuleDef) -> Option<Visibility> {
-        db.crate_def_map(self.id.krate)[self.id.local_id].scope.visibility_of(def.clone().into())
+        self.id.def_map(db.upcast())[self.id.local_id].scope.visibility_of(def.clone().into())
     }
 
     pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
         let _p = profile::span("Module::diagnostics").detail(|| {
             format!("{:?}", self.name(db).map_or("<unknown>".into(), |name| name.to_string()))
         });
-        let crate_def_map = db.crate_def_map(self.id.krate);
+        let crate_def_map = self.id.def_map(db.upcast());
         crate_def_map.add_diagnostics(db.upcast(), self.id.local_id, sink);
         for decl in self.declarations(db) {
             match decl {
@@ -396,12 +396,12 @@ pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
     }
 
     pub fn declarations(self, db: &dyn HirDatabase) -> Vec<ModuleDef> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         def_map[self.id.local_id].scope.declarations().map(ModuleDef::from).collect()
     }
 
     pub fn impl_defs(self, db: &dyn HirDatabase) -> Vec<Impl> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         def_map[self.id.local_id].scope.impls().map(Impl::from).collect()
     }
 
diff --git a/crates/hir/src/has_source.rs b/crates/hir/src/has_source.rs
index 7c57d8378cca..2620026713c8 100644
--- a/crates/hir/src/has_source.rs
+++ b/crates/hir/src/has_source.rs
@@ -24,12 +24,12 @@ pub trait HasSource {
 impl Module {
     /// Returns a node which defines this module. That is, a file or a `mod foo {}` with items.
     pub fn definition_source(self, db: &dyn HirDatabase) -> InFile<ModuleSource> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         def_map[self.id.local_id].definition_source(db.upcast())
     }
 
     pub fn is_mod_rs(self, db: &dyn HirDatabase) -> bool {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         match def_map[self.id.local_id].origin {
             ModuleOrigin::File { is_mod_rs, .. } => is_mod_rs,
             _ => false,
@@ -39,7 +39,7 @@ pub fn is_mod_rs(self, db: &dyn HirDatabase) -> bool {
     /// Returns a node which declares this module, either a `mod foo;` or a `mod foo {}`.
     /// `None` for the crate root.
     pub fn declaration_source(self, db: &dyn HirDatabase) -> Option<InFile<ast::Module>> {
-        let def_map = db.crate_def_map(self.id.krate);
+        let def_map = self.id.def_map(db.upcast());
         def_map[self.id.local_id].declaration_source(db.upcast())
     }
 }
diff --git a/crates/hir/src/semantics/source_to_def.rs b/crates/hir/src/semantics/source_to_def.rs
index 9bf60c72af80..775f7ec8b768 100644
--- a/crates/hir/src/semantics/source_to_def.rs
+++ b/crates/hir/src/semantics/source_to_def.rs
@@ -31,6 +31,7 @@ impl SourceToDefCtx<'_, '_> {
     pub(super) fn file_to_def(&mut self, file: FileId) -> Option<ModuleId> {
         let _p = profile::span("SourceBinder::to_module_def");
         let (krate, local_id) = self.db.relevant_crates(file).iter().find_map(|&crate_id| {
+            // FIXME: inner items
             let crate_def_map = self.db.crate_def_map(crate_id);
             let local_id = crate_def_map.modules_for_file(file).next()?;
             Some((crate_id, local_id))
@@ -60,7 +61,7 @@ pub(super) fn module_to_def(&mut self, src: InFile<ast::Module>) -> Option<Modul
         }?;
 
         let child_name = src.value.name()?.as_name();
-        let def_map = self.db.crate_def_map(parent_module.krate);
+        let def_map = parent_module.def_map(self.db.upcast());
         let child_id = *def_map[parent_module.local_id].children.get(&child_name)?;
         Some(ModuleId { krate: parent_module.krate, local_id: child_id })
     }
diff --git a/crates/hir_def/src/attr.rs b/crates/hir_def/src/attr.rs
index c72649c41e4d..6513daec87dc 100644
--- a/crates/hir_def/src/attr.rs
+++ b/crates/hir_def/src/attr.rs
@@ -196,7 +196,7 @@ impl Attrs {
     pub(crate) fn attrs_query(db: &dyn DefDatabase, def: AttrDefId) -> Attrs {
         let raw_attrs = match def {
             AttrDefId::ModuleId(module) => {
-                let def_map = db.crate_def_map(module.krate);
+                let def_map = module.def_map(db);
                 let mod_data = &def_map[module.local_id];
                 match mod_data.declaration_source(db) {
                     Some(it) => {
diff --git a/crates/hir_def/src/body.rs b/crates/hir_def/src/body.rs
index 2c2c999dd0a7..d0c84ab0b590 100644
--- a/crates/hir_def/src/body.rs
+++ b/crates/hir_def/src/body.rs
@@ -86,7 +86,7 @@ pub(crate) fn new(
         module: ModuleId,
     ) -> Expander {
         let cfg_expander = CfgExpander::new(db, current_file_id, module.krate);
-        let crate_def_map = db.crate_def_map(module.krate);
+        let crate_def_map = module.def_map(db);
         let ast_id_map = db.ast_id_map(current_file_id);
         Expander {
             cfg_expander,
diff --git a/crates/hir_def/src/child_by_source.rs b/crates/hir_def/src/child_by_source.rs
index dcb00a1d9a0b..65d85c86a782 100644
--- a/crates/hir_def/src/child_by_source.rs
+++ b/crates/hir_def/src/child_by_source.rs
@@ -74,7 +74,7 @@ fn child_by_source(&self, db: &dyn DefDatabase) -> DynMap {
 
 impl ChildBySource for ModuleId {
     fn child_by_source(&self, db: &dyn DefDatabase) -> DynMap {
-        let crate_def_map = db.crate_def_map(self.krate);
+        let crate_def_map = self.def_map(db);
         let module_data = &crate_def_map[self.local_id];
         module_data.scope.child_by_source(db)
     }
diff --git a/crates/hir_def/src/find_path.rs b/crates/hir_def/src/find_path.rs
index db2d125aeac3..c01b6daf2c03 100644
--- a/crates/hir_def/src/find_path.rs
+++ b/crates/hir_def/src/find_path.rs
@@ -110,7 +110,7 @@ fn find_path_inner(
     // Base cases:
 
     // - if the item is already in scope, return the name under which it is
-    let def_map = db.crate_def_map(from.krate);
+    let def_map = from.def_map(db);
     let from_scope: &crate::item_scope::ItemScope = &def_map[from.local_id].scope;
     let scope_name =
         if let Some((name, _)) = from_scope.name_of(item) { Some(name.clone()) } else { None };
@@ -145,7 +145,7 @@ fn find_path_inner(
 
     // - if the item is in the prelude, return the name from there
     if let Some(prelude_module) = def_map.prelude() {
-        let prelude_def_map = db.crate_def_map(prelude_module.krate);
+        let prelude_def_map = prelude_module.def_map(db);
         let prelude_scope: &crate::item_scope::ItemScope =
             &prelude_def_map[prelude_module.local_id].scope;
         if let Some((name, vis)) = prelude_scope.name_of(item) {
@@ -283,7 +283,7 @@ fn find_local_import_locations(
     // above `from` with any visibility. That means we do not need to descend into private siblings
     // of `from` (and similar).
 
-    let def_map = db.crate_def_map(from.krate);
+    let def_map = from.def_map(db);
 
     // Compute the initial worklist. We start with all direct child modules of `from` as well as all
     // of its (recursive) parent modules.
@@ -312,7 +312,7 @@ fn find_local_import_locations(
             &def_map[module.local_id]
         } else {
             // The crate might reexport a module defined in another crate.
-            ext_def_map = db.crate_def_map(module.krate);
+            ext_def_map = module.def_map(db);
             &ext_def_map[module.local_id]
         };
 
@@ -375,7 +375,7 @@ fn check_found_path_(ra_fixture: &str, path: &str, prefix_kind: Option<PrefixKin
             parsed_path_file.syntax_node().descendants().find_map(syntax::ast::Path::cast).unwrap();
         let mod_path = ModPath::from_src(ast_path, &Hygiene::new_unhygienic()).unwrap();
 
-        let crate_def_map = db.crate_def_map(module.krate);
+        let crate_def_map = module.def_map(&db);
         let resolved = crate_def_map
             .resolve_path(
                 &db,
diff --git a/crates/hir_def/src/import_map.rs b/crates/hir_def/src/import_map.rs
index 0251d016b74a..0b783044564b 100644
--- a/crates/hir_def/src/import_map.rs
+++ b/crates/hir_def/src/import_map.rs
@@ -83,7 +83,7 @@ pub fn import_map_query(db: &dyn DefDatabase, krate: CrateId) -> Arc<Self> {
                 &def_map[module.local_id]
             } else {
                 // The crate might reexport a module defined in another crate.
-                ext_def_map = db.crate_def_map(module.krate);
+                ext_def_map = module.def_map(db);
                 &ext_def_map[module.local_id]
             };
 
diff --git a/crates/hir_def/src/lib.rs b/crates/hir_def/src/lib.rs
index 08ed920c60a0..2f9261a7fe6b 100644
--- a/crates/hir_def/src/lib.rs
+++ b/crates/hir_def/src/lib.rs
@@ -50,7 +50,10 @@ macro_rules! eprintln {
 #[cfg(test)]
 mod test_db;
 
-use std::hash::{Hash, Hasher};
+use std::{
+    hash::{Hash, Hasher},
+    sync::Arc,
+};
 
 use base_db::{impl_intern_key, salsa, CrateId};
 use hir_expand::{
@@ -58,6 +61,7 @@ macro_rules! eprintln {
     MacroCallId, MacroCallKind, MacroDefId, MacroDefKind,
 };
 use la_arena::Idx;
+use nameres::DefMap;
 use syntax::ast;
 
 use crate::builtin_type::BuiltinType;
@@ -73,6 +77,12 @@ pub struct ModuleId {
     pub local_id: LocalModuleId,
 }
 
+impl ModuleId {
+    pub fn def_map(&self, db: &dyn db::DefDatabase) -> Arc<DefMap> {
+        db.crate_def_map(self.krate)
+    }
+}
+
 /// An ID of a module, **local** to a specific crate
 pub type LocalModuleId = Idx<nameres::ModuleData>;
 
diff --git a/crates/hir_def/src/nameres/collector.rs b/crates/hir_def/src/nameres/collector.rs
index cd68efbe6787..adfcf879a448 100644
--- a/crates/hir_def/src/nameres/collector.rs
+++ b/crates/hir_def/src/nameres/collector.rs
@@ -578,7 +578,7 @@ fn record_resolved_import(&mut self, directive: &ImportDirective) {
                     } else if m.krate != self.def_map.krate {
                         mark::hit!(glob_across_crates);
                         // glob import from other crate => we can just import everything once
-                        let item_map = self.db.crate_def_map(m.krate);
+                        let item_map = m.def_map(self.db);
                         let scope = &item_map[m.local_id].scope;
 
                         // Module scoped macros is included
diff --git a/crates/hir_def/src/nameres/path_resolution.rs b/crates/hir_def/src/nameres/path_resolution.rs
index ec90f4e65054..82528b792062 100644
--- a/crates/hir_def/src/nameres/path_resolution.rs
+++ b/crates/hir_def/src/nameres/path_resolution.rs
@@ -243,7 +243,7 @@ pub(super) fn resolve_path_fp_with_macro_single(
                             kind: PathKind::Super(0),
                         };
                         log::debug!("resolving {:?} in other crate", path);
-                        let defp_map = db.crate_def_map(module.krate);
+                        let defp_map = module.def_map(db);
                         let (def, s) = defp_map.resolve_path(db, module.local_id, &path, shadow);
                         return ResolvePathResult::with(
                             def,
@@ -356,7 +356,7 @@ fn resolve_in_prelude(&self, db: &dyn DefDatabase, name: &Name) -> PerNs {
                 self
             } else {
                 // Extend lifetime
-                keep = db.crate_def_map(prelude.krate);
+                keep = prelude.def_map(db);
                 &keep
             };
             def_map[prelude.local_id].scope.get(name)
diff --git a/crates/hir_def/src/resolver.rs b/crates/hir_def/src/resolver.rs
index b2f5776497da..130c074f0887 100644
--- a/crates/hir_def/src/resolver.rs
+++ b/crates/hir_def/src/resolver.rs
@@ -430,7 +430,7 @@ pub fn traits_in_scope(&self, db: &dyn DefDatabase) -> FxHashSet<TraitId> {
         for scope in &self.scopes {
             if let Scope::ModuleScope(m) = scope {
                 if let Some(prelude) = m.crate_def_map.prelude() {
-                    let prelude_def_map = db.crate_def_map(prelude.krate);
+                    let prelude_def_map = prelude.def_map(db);
                     traits.extend(prelude_def_map[prelude.local_id].scope.traits());
                 }
                 traits.extend(m.crate_def_map[m.module_id].scope.traits());
@@ -529,7 +529,7 @@ fn process_names(&self, db: &dyn DefDatabase, f: &mut dyn FnMut(Name, ScopeDef))
                     f(name.clone(), ScopeDef::PerNs(def));
                 });
                 if let Some(prelude) = m.crate_def_map.prelude() {
-                    let prelude_def_map = db.crate_def_map(prelude.krate);
+                    let prelude_def_map = prelude.def_map(db);
                     prelude_def_map[prelude.local_id].scope.entries().for_each(|(name, def)| {
                         let seen_tuple = (name.clone(), def);
                         if !seen.contains(&seen_tuple) {
@@ -633,7 +633,7 @@ pub trait HasResolver: Copy {
 
 impl HasResolver for ModuleId {
     fn resolver(self, db: &dyn DefDatabase) -> Resolver {
-        let def_map = db.crate_def_map(self.krate);
+        let def_map = self.def_map(db);
         Resolver::default().push_module_scope(def_map, self.local_id)
     }
 }
diff --git a/crates/hir_def/src/visibility.rs b/crates/hir_def/src/visibility.rs
index 3134fa43d023..e79a91102381 100644
--- a/crates/hir_def/src/visibility.rs
+++ b/crates/hir_def/src/visibility.rs
@@ -103,7 +103,7 @@ pub fn is_visible_from(self, db: &dyn DefDatabase, from_module: ModuleId) -> boo
         if from_module.krate != to_module.krate {
             return false;
         }
-        let def_map = db.crate_def_map(from_module.krate);
+        let def_map = from_module.def_map(db);
         self.is_visible_from_def_map(&def_map, from_module.local_id)
     }
 
diff --git a/crates/hir_ty/src/tests.rs b/crates/hir_ty/src/tests.rs
index 4a3fcea8dc41..25ee664d6f4c 100644
--- a/crates/hir_ty/src/tests.rs
+++ b/crates/hir_ty/src/tests.rs
@@ -188,10 +188,10 @@ fn infer_with_mismatches(content: &str, include_mismatches: bool) -> String {
     };
 
     let module = db.module_for_file(file_id);
-    let crate_def_map = db.crate_def_map(module.krate);
+    let def_map = module.def_map(&db);
 
     let mut defs: Vec<DefWithBodyId> = Vec::new();
-    visit_module(&db, &crate_def_map, module.local_id, &mut |it| defs.push(it));
+    visit_module(&db, &def_map, module.local_id, &mut |it| defs.push(it));
     defs.sort_by_key(|def| match def {
         DefWithBodyId::FunctionId(it) => {
             let loc = it.lookup(&db);
@@ -321,7 +321,7 @@ fn foo() -> i32 {
     {
         let events = db.log_executed(|| {
             let module = db.module_for_file(pos.file_id);
-            let crate_def_map = db.crate_def_map(module.krate);
+            let crate_def_map = module.def_map(&db);
             visit_module(&db, &crate_def_map, module.local_id, &mut |def| {
                 db.infer(def);
             });