8 files changed, 44 insertions, 24 deletions

diff --git a/crates/ra_db/src/input.rs b/crates/ra_db/src/input.rs
index 8decc65c5..76998ea30 100644
--- a/crates/ra_db/src/input.rs
+++ b/crates/ra_db/src/input.rs
@@ -56,15 +56,22 @@ pub struct CyclicDependencies;
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct CrateId(pub u32);
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Edition {
+    Edition2018,
+    Edition2015,
+}
+
 #[derive(Debug, Clone, PartialEq, Eq)]
 struct CrateData {
     file_id: FileId,
+    edition: Edition,
     dependencies: Vec<Dependency>,
 }
 
 impl CrateData {
-    fn new(file_id: FileId) -> CrateData {
-        CrateData { file_id, dependencies: Vec::new() }
+    fn new(file_id: FileId, edition: Edition) -> CrateData {
+        CrateData { file_id, edition, dependencies: Vec::new() }
     }
 
     fn add_dep(&mut self, name: SmolStr, crate_id: CrateId) {
@@ -85,9 +92,9 @@ impl Dependency {
 }
 
 impl CrateGraph {
-    pub fn add_crate_root(&mut self, file_id: FileId) -> CrateId {
+    pub fn add_crate_root(&mut self, file_id: FileId, edition: Edition) -> CrateId {
         let crate_id = CrateId(self.arena.len() as u32);
-        let prev = self.arena.insert(crate_id, CrateData::new(file_id));
+        let prev = self.arena.insert(crate_id, CrateData::new(file_id, edition));
         assert!(prev.is_none());
         crate_id
     }
@@ -159,14 +166,14 @@ impl CrateGraph {
 
 #[cfg(test)]
 mod tests {
-    use super::{CrateGraph, FileId, SmolStr};
+    use super::{CrateGraph, FileId, SmolStr, Edition::Edition2018};
 
     #[test]
-    fn it_should_painc_because_of_cycle_dependencies() {
+    fn it_should_panic_because_of_cycle_dependencies() {
         let mut graph = CrateGraph::default();
-        let crate1 = graph.add_crate_root(FileId(1u32));
-        let crate2 = graph.add_crate_root(FileId(2u32));
-        let crate3 = graph.add_crate_root(FileId(3u32));
+        let crate1 = graph.add_crate_root(FileId(1u32), Edition2018);
+        let crate2 = graph.add_crate_root(FileId(2u32), Edition2018);
+        let crate3 = graph.add_crate_root(FileId(3u32), Edition2018);
         assert!(graph.add_dep(crate1, SmolStr::new("crate2"), crate2).is_ok());
         assert!(graph.add_dep(crate2, SmolStr::new("crate3"), crate3).is_ok());
         assert!(graph.add_dep(crate3, SmolStr::new("crate1"), crate1).is_err());
@@ -175,9 +182,9 @@ mod tests {
     #[test]
     fn it_works() {
         let mut graph = CrateGraph::default();
-        let crate1 = graph.add_crate_root(FileId(1u32));
-        let crate2 = graph.add_crate_root(FileId(2u32));
-        let crate3 = graph.add_crate_root(FileId(3u32));
+        let crate1 = graph.add_crate_root(FileId(1u32), Edition2018);
+        let crate2 = graph.add_crate_root(FileId(2u32), Edition2018);
+        let crate3 = graph.add_crate_root(FileId(3u32), Edition2018);
         assert!(graph.add_dep(crate1, SmolStr::new("crate2"), crate2).is_ok());
         assert!(graph.add_dep(crate2, SmolStr::new("crate3"), crate3).is_ok());
     }
diff --git a/crates/ra_db/src/lib.rs b/crates/ra_db/src/lib.rs
index 31442713d..e006c6d27 100644
--- a/crates/ra_db/src/lib.rs
+++ b/crates/ra_db/src/lib.rs
@@ -14,7 +14,7 @@ pub use ::salsa as salsa;
 pub use crate::{
     cancellation::Canceled,
     input::{
-        FileId, CrateId, SourceRoot, SourceRootId, CrateGraph, Dependency,
+        FileId, CrateId, SourceRoot, SourceRootId, CrateGraph, Dependency, Edition,
     },
     loc2id::LocationIntener,
 };
diff --git a/crates/ra_hir/src/mock.rs b/crates/ra_hir/src/mock.rs
index 5ca870867..145ed39a1 100644
--- a/crates/ra_hir/src/mock.rs
+++ b/crates/ra_hir/src/mock.rs
@@ -3,6 +3,7 @@ use std::{sync::Arc, panic};
 use parking_lot::Mutex;
 use ra_db::{
     FilePosition, FileId, CrateGraph, SourceRoot, SourceRootId, SourceDatabase, salsa,
+    Edition,
 };
 use relative_path::RelativePathBuf;
 use test_utils::{parse_fixture, CURSOR_MARKER, extract_offset};
@@ -60,7 +61,7 @@ impl MockDatabase {
         let mut crate_graph = CrateGraph::default();
         for (crate_name, (crate_root, _)) in graph.0.iter() {
             let crate_root = self.file_id_of(&crate_root);
-            let crate_id = crate_graph.add_crate_root(crate_root);
+            let crate_id = crate_graph.add_crate_root(crate_root, Edition::Edition2018);
             ids.insert(crate_name, crate_id);
         }
         for (crate_name, (_, deps)) in graph.0.iter() {
@@ -144,7 +145,7 @@ impl MockDatabase {
 
         if is_crate_root {
             let mut crate_graph = CrateGraph::default();
-            crate_graph.add_crate_root(file_id);
+            crate_graph.add_crate_root(file_id, Edition::Edition2018);
             self.set_crate_graph(Arc::new(crate_graph));
         }
         file_id
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index de3ec4e0a..d77a56ce8 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -62,7 +62,8 @@ pub use ra_ide_api_light::{
     LineIndex, LineCol, translate_offset_with_edit,
 };
 pub use ra_db::{
-    Canceled, CrateGraph, CrateId, FileId, FilePosition, FileRange, SourceRootId
+    Canceled, CrateGraph, CrateId, FileId, FilePosition, FileRange, SourceRootId,
+    Edition
 };
 pub use hir::Documentation;
 
diff --git a/crates/ra_ide_api/src/mock_analysis.rs b/crates/ra_ide_api/src/mock_analysis.rs
index 017ac5de3..550d69641 100644
--- a/crates/ra_ide_api/src/mock_analysis.rs
+++ b/crates/ra_ide_api/src/mock_analysis.rs
@@ -3,7 +3,7 @@ use std::sync::Arc;
 use relative_path::RelativePathBuf;
 use test_utils::{extract_offset, extract_range, parse_fixture, CURSOR_MARKER};
 
-use crate::{Analysis, AnalysisChange, AnalysisHost, CrateGraph, FileId, FilePosition, FileRange, SourceRootId};
+use crate::{Analysis, AnalysisChange, AnalysisHost, CrateGraph, FileId, FilePosition, FileRange, SourceRootId, Edition::Edition2018};
 
 /// Mock analysis is used in test to bootstrap an AnalysisHost/Analysis
 /// from a set of in-memory files.
@@ -89,9 +89,9 @@ impl MockAnalysis {
             let path = RelativePathBuf::from_path(&path[1..]).unwrap();
             let file_id = FileId(i as u32 + 1);
             if path == "/lib.rs" || path == "/main.rs" {
-                root_crate = Some(crate_graph.add_crate_root(file_id));
+                root_crate = Some(crate_graph.add_crate_root(file_id, Edition2018));
             } else if path.ends_with("/lib.rs") {
-                let other_crate = crate_graph.add_crate_root(file_id);
+                let other_crate = crate_graph.add_crate_root(file_id, Edition2018);
                 let crate_name = path.parent().unwrap().file_name().unwrap();
                 if let Some(root_crate) = root_crate {
                     crate_graph.add_dep(root_crate, crate_name.into(), other_crate).unwrap();
diff --git a/crates/ra_ide_api/tests/test/main.rs b/crates/ra_ide_api/tests/test/main.rs
index 4cf842452..0526f7584 100644
--- a/crates/ra_ide_api/tests/test/main.rs
+++ b/crates/ra_ide_api/tests/test/main.rs
@@ -1,7 +1,7 @@
 use insta::assert_debug_snapshot_matches;
 use ra_ide_api::{
     mock_analysis::{single_file, single_file_with_position, MockAnalysis},
-    AnalysisChange, CrateGraph, FileId, Query, NavigationTarget,
+    AnalysisChange, CrateGraph, Edition::Edition2018, FileId, Query, NavigationTarget
 };
 use ra_syntax::{TextRange, SmolStr};
 
@@ -36,7 +36,7 @@ fn test_resolve_crate_root() {
     assert!(host.analysis().crate_for(mod_file).unwrap().is_empty());
 
     let mut crate_graph = CrateGraph::default();
-    let crate_id = crate_graph.add_crate_root(root_file);
+    let crate_id = crate_graph.add_crate_root(root_file, Edition2018);
     let mut change = AnalysisChange::new();
     change.set_crate_graph(crate_graph);
     host.apply_change(change);
diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index 5866be519..e28aca259 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -35,6 +35,7 @@ struct PackageData {
     targets: Vec<Target>,
     is_member: bool,
     dependencies: Vec<PackageDependency>,
+    edition: String,
 }
 
 #[derive(Debug, Clone)]
@@ -84,6 +85,9 @@ impl Package {
     pub fn root(self, ws: &CargoWorkspace) -> &Path {
         ws.packages[self].manifest.parent().unwrap()
     }
+    pub fn edition(self, ws: &CargoWorkspace) -> &str {
+        &ws.packages[self].edition
+    }
     pub fn targets<'a>(self, ws: &'a CargoWorkspace) -> impl Iterator<Item = Target> + 'a {
         ws.packages[self].targets.iter().cloned()
     }
@@ -135,6 +139,7 @@ impl CargoWorkspace {
                 manifest: meta_pkg.manifest_path.clone(),
                 targets: Vec::new(),
                 is_member,
+                edition: meta_pkg.edition,
                 dependencies: Vec::new(),
             });
             let pkg_data = &mut packages[pkg];
diff --git a/crates/ra_project_model/src/lib.rs b/crates/ra_project_model/src/lib.rs
index 3b1e07149..e5c93fd85 100644
--- a/crates/ra_project_model/src/lib.rs
+++ b/crates/ra_project_model/src/lib.rs
@@ -6,7 +6,7 @@ use std::path::{Path, PathBuf};
 use failure::bail;
 use rustc_hash::FxHashMap;
 
-use ra_db::{CrateGraph, FileId};
+use ra_db::{CrateGraph, FileId, Edition};
 
 pub use crate::{
     cargo_workspace::{CargoWorkspace, Package, Target, TargetKind},
@@ -36,7 +36,8 @@ impl ProjectWorkspace {
         let mut sysroot_crates = FxHashMap::default();
         for krate in self.sysroot.crates() {
             if let Some(file_id) = load(krate.root(&self.sysroot)) {
-                sysroot_crates.insert(krate, crate_graph.add_crate_root(file_id));
+                sysroot_crates
+                    .insert(krate, crate_graph.add_crate_root(file_id, Edition::Edition2015));
             }
         }
         for from in self.sysroot.crates() {
@@ -62,7 +63,12 @@ impl ProjectWorkspace {
             for tgt in pkg.targets(&self.cargo) {
                 let root = tgt.root(&self.cargo);
                 if let Some(file_id) = load(root) {
-                    let crate_id = crate_graph.add_crate_root(file_id);
+                    let edition = if pkg.edition(&self.cargo) == "2015" {
+                        Edition::Edition2015
+                    } else {
+                        Edition::Edition2018
+                    };
+                    let crate_id = crate_graph.add_crate_root(file_id, edition);
                     if tgt.kind(&self.cargo) == TargetKind::Lib {
                         lib_tgt = Some(crate_id);
                         pkg_to_lib_crate.insert(pkg, crate_id);