6 files changed, 28 insertions, 10 deletions

diff --git a/crates/ra_db/src/fixture.rs b/crates/ra_db/src/fixture.rs
index 3dc86ca2d..3464f43df 100644
--- a/crates/ra_db/src/fixture.rs
+++ b/crates/ra_db/src/fixture.rs
@@ -64,7 +64,9 @@ fn with_single_file(db: &mut dyn SourceDatabaseExt, ra_fixture: &str) -> FileId
         crate_graph.add_crate_root(
             file_id,
             meta.edition,
-            meta.krate,
+            meta.krate.map(|name| {
+                CrateName::new(&name).expect("Fixture crate name should not contain dashes")
+            }),
             meta.cfg,
             meta.env,
             Default::default(),
@@ -124,7 +126,7 @@ fn with_files(db: &mut dyn SourceDatabaseExt, fixture: &str) -> Option<FilePosit
             let crate_id = crate_graph.add_crate_root(
                 file_id,
                 meta.edition,
-                Some(krate.clone()),
+                Some(CrateName::new(&krate).unwrap()),
                 meta.cfg,
                 meta.env,
                 Default::default(),
diff --git a/crates/ra_db/src/input.rs b/crates/ra_db/src/input.rs
index 06d40db96..bde843001 100644
--- a/crates/ra_db/src/input.rs
+++ b/crates/ra_db/src/input.rs
@@ -14,6 +14,7 @@ use rustc_hash::FxHashMap;
 use rustc_hash::FxHashSet;
 
 use crate::{RelativePath, RelativePathBuf};
+use fmt::Display;
 
 /// `FileId` is an integer which uniquely identifies a file. File paths are
 /// messy and system-dependent, so most of the code should work directly with
@@ -83,6 +84,7 @@ pub struct CrateGraph {
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct CrateId(pub u32);
 
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct CrateName(SmolStr);
 
 impl CrateName {
@@ -103,6 +105,12 @@ impl CrateName {
     }
 }
 
+impl Display for CrateName {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct CrateData {
     pub root_file_id: FileId,
@@ -110,7 +118,7 @@ pub struct CrateData {
     /// The name to display to the end user.
     /// This actual crate name can be different in a particular dependent crate
     /// or may even be missing for some cases, such as a dummy crate for the code snippet.
-    pub display_name: Option<String>,
+    pub display_name: Option<CrateName>,
     pub cfg_options: CfgOptions,
     pub env: Env,
     pub extern_source: ExternSource,
@@ -150,7 +158,7 @@ impl CrateGraph {
         &mut self,
         file_id: FileId,
         edition: Edition,
-        display_name: Option<String>,
+        display_name: Option<CrateName>,
         cfg_options: CfgOptions,
         env: Env,
         extern_source: ExternSource,
diff --git a/crates/ra_hir_def/src/nameres.rs b/crates/ra_hir_def/src/nameres.rs
index 81eac52ad..03515309e 100644
--- a/crates/ra_hir_def/src/nameres.rs
+++ b/crates/ra_hir_def/src/nameres.rs
@@ -177,8 +177,13 @@ pub struct ModuleData {
 
 impl CrateDefMap {
     pub(crate) fn crate_def_map_query(db: &impl DefDatabase, krate: CrateId) -> Arc<CrateDefMap> {
-        let _p = profile("crate_def_map_query")
-            .detail(|| db.crate_graph()[krate].display_name.clone().unwrap_or_default());
+        let _p = profile("crate_def_map_query").detail(|| {
+            db.crate_graph()[krate]
+                .display_name
+                .as_ref()
+                .map(ToString::to_string)
+                .unwrap_or_default()
+        });
         let def_map = {
             let edition = db.crate_graph()[krate].edition;
             let mut modules: Arena<LocalModuleId, ModuleData> = Arena::default();
diff --git a/crates/ra_ide/src/hover.rs b/crates/ra_ide/src/hover.rs
index 3bdd61a2e..5b3760c18 100644
--- a/crates/ra_ide/src/hover.rs
+++ b/crates/ra_ide/src/hover.rs
@@ -94,7 +94,7 @@ fn definition_owner_name(db: &RootDatabase, def: &Definition) -> Option<String>
 
 fn determine_mod_path(db: &RootDatabase, def: &Definition) -> Option<String> {
     let mod_path = def.module(db).map(|module| {
-        once(db.crate_graph()[module.krate().into()].display_name.clone())
+        once(db.crate_graph()[module.krate().into()].display_name.as_ref().map(ToString::to_string))
             .chain(
                 module
                     .path_to_root(db)
diff --git a/crates/ra_ide/src/mock_analysis.rs b/crates/ra_ide/src/mock_analysis.rs
index 25816cf6f..2cf77a31f 100644
--- a/crates/ra_ide/src/mock_analysis.rs
+++ b/crates/ra_ide/src/mock_analysis.rs
@@ -109,7 +109,7 @@ impl MockAnalysis {
                 let other_crate = crate_graph.add_crate_root(
                     file_id,
                     Edition2018,
-                    Some(crate_name.to_owned()),
+                    Some(CrateName::new(crate_name).unwrap()),
                     cfg_options,
                     Env::default(),
                     Default::default(),
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index a6274709d..897874813 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -245,7 +245,10 @@ impl ProjectWorkspace {
                         let crate_id = crate_graph.add_crate_root(
                             file_id,
                             Edition::Edition2018,
-                            Some(krate.name(&sysroot).to_string()),
+                            Some(
+                                CrateName::new(krate.name(&sysroot))
+                                    .expect("Sysroot crate names should not contain dashes"),
+                            ),
                             cfg_options,
                             env,
                             extern_source,
@@ -296,7 +299,7 @@ impl ProjectWorkspace {
                             let crate_id = crate_graph.add_crate_root(
                                 file_id,
                                 edition,
-                                Some(pkg.name(&cargo).to_string()),
+                                Some(CrateName::normalize_dashes(pkg.name(&cargo))),
                                 cfg_options,
                                 env,
                                 extern_source,