3 files changed, 13 insertions, 24 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 872e66118..e7b873076 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1087,7 +1087,6 @@ dependencies = [
  "rustc-hash",
  "superslice",
  "test_utils",
- "unicase",
 ]
 
 [[package]]
@@ -1599,15 +1598,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "unicase"
-version = "2.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
-dependencies = [
- "version_check",
-]
-
-[[package]]
 name = "unicode-bidi"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1650,12 +1640,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "version_check"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
-
-[[package]]
 name = "walkdir"
 version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/crates/ra_ide_db/Cargo.toml b/crates/ra_ide_db/Cargo.toml
index ad3acce59..dbe98f3a0 100644
--- a/crates/ra_ide_db/Cargo.toml
+++ b/crates/ra_ide_db/Cargo.toml
@@ -20,7 +20,6 @@ log = "0.4.5"
 rayon = "1.0.2"
 fst = { version = "0.3.1", default-features = false }
 rustc-hash = "1.0"
-unicase = "2.2.0"
 superslice = "1.0.0"
 once_cell = "1.2.0"
 
diff --git a/crates/ra_ide_db/src/symbol_index.rs b/crates/ra_ide_db/src/symbol_index.rs
index 64ddf2f95..e6b3126b6 100644
--- a/crates/ra_ide_db/src/symbol_index.rs
+++ b/crates/ra_ide_db/src/symbol_index.rs
@@ -21,6 +21,7 @@
 //! those FSTs.
 
 use std::{
+    cmp::Ordering,
     fmt,
     hash::{Hash, Hasher},
     mem,
@@ -187,29 +188,34 @@ impl Hash for SymbolIndex {
 
 impl SymbolIndex {
     fn new(mut symbols: Vec<FileSymbol>) -> SymbolIndex {
-        fn cmp_key<'a>(s1: &'a FileSymbol) -> impl Ord + 'a {
-            unicase::Ascii::new(s1.name.as_str())
+        fn cmp(lhs: &FileSymbol, rhs: &FileSymbol) -> Ordering {
+            let lhs_chars = lhs.name.chars().map(|c| c.to_ascii_lowercase());
+            let rhs_chars = rhs.name.chars().map(|c| c.to_ascii_lowercase());
+            lhs_chars.cmp(rhs_chars)
         }
+
         #[cfg(not(feature = "wasm"))]
-        symbols.par_sort_by(|s1, s2| cmp_key(s1).cmp(&cmp_key(s2)));
+        symbols.par_sort_by(cmp);
 
         #[cfg(feature = "wasm")]
-        symbols.sort_by(|s1, s2| cmp_key(s1).cmp(&cmp_key(s2)));
+        symbols.sort_by(cmp);
 
         let mut builder = fst::MapBuilder::memory();
 
         let mut last_batch_start = 0;
 
         for idx in 0..symbols.len() {
-            if symbols.get(last_batch_start).map(cmp_key) == symbols.get(idx + 1).map(cmp_key) {
-                continue;
+            if let Some(next_symbol) = symbols.get(idx + 1) {
+                if cmp(&symbols[last_batch_start], next_symbol) == Ordering::Equal {
+                    continue;
+                }
             }
 
             let start = last_batch_start;
             let end = idx + 1;
             last_batch_start = end;
 
-            let key = symbols[start].name.as_str().to_lowercase();
+            let key = symbols[start].name.as_str().to_ascii_lowercase();
             let value = SymbolIndex::range_to_map_value(start, end);
 
             builder.insert(key, value).unwrap();