1 files changed, 11 insertions, 1 deletions

diff --git a/crates/ra_analysis/src/db.rs b/crates/ra_analysis/src/db.rs
index d621b3b22..09d74b9e7 100644
--- a/crates/ra_analysis/src/db.rs
+++ b/crates/ra_analysis/src/db.rs
@@ -10,7 +10,8 @@ use rustc_hash::FxHashSet;
 use salsa;
 
 use crate::{
-    Cancelable,
+    db,
+    Cancelable, Canceled,
     module_map::{ModuleDescriptorQuery, ModuleTreeQuery, ModulesDatabase},
     symbol_index::SymbolIndex,
     FileId, FileResolverImp,
@@ -33,6 +34,14 @@ impl salsa::Database for RootDatabase {
     }
 }
 
+pub(crate) fn check_canceled(db: &impl salsa::Database) -> Cancelable<()> {
+    if db.salsa_runtime().is_current_revision_canceled() {
+        Err(Canceled)
+    } else {
+        Ok(())
+    }
+}
+
 impl salsa::ParallelDatabase for RootDatabase {
     fn fork(&self) -> Self {
         RootDatabase {
@@ -115,6 +124,7 @@ fn file_lines(db: &impl SyntaxDatabase, file_id: FileId) -> Arc<LineIndex> {
     Arc::new(LineIndex::new(&*text))
 }
 fn file_symbols(db: &impl SyntaxDatabase, file_id: FileId) -> Cancelable<Arc<SymbolIndex>> {
+    db::check_canceled(db)?;
     let syntax = db.file_syntax(file_id);
     Ok(Arc::new(SymbolIndex::for_file(file_id, syntax)))
 }