2 files changed, 14 insertions, 4 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,