Fix clippy::len_zero

crates/ra_hir/src/path.rs

@@ -116,7 +116,7 @@ impl Path {
 
     /// `true` if this path is just a standalone `self`
     pub fn is_self(&self) -> bool {
-        self.kind == PathKind::Self_ && self.segments.len() == 0
+        self.kind == PathKind::Self_ && self.segments.is_empty()
     }
 
     /// If this path is a single identifier, like `foo`, return its name.
@@ -140,7 +140,7 @@ impl GenericArgs {
             args.push(GenericArg::Type(type_ref));
         }
         // lifetimes and assoc type args ignored for now
-        if args.len() > 0 {
+        if !args.is_empty() {
             Some(GenericArgs { args })
         } else {
             None

crates/ra_ide_api/src/line_index.rs

@@ -41,7 +41,7 @@ impl LineIndex {
                 newlines.push(curr_row);
 
                 // Save any utf-16 characters seen in the previous line
-                if utf16_chars.len() > 0 {
+                if !utf16_chars.is_empty() {
                     utf16_lines.insert(line, utf16_chars);
                     utf16_chars = Vec::new();
                 }
@@ -61,7 +61,7 @@ impl LineIndex {
         }
 
         // Save any utf-16 characters seen in the last line
-        if utf16_chars.len() > 0 {
+        if !utf16_chars.is_empty() {
             utf16_lines.insert(line, utf16_chars);
         }
 

crates/ra_mbe/src/syntax_bridge.rs

@@ -292,7 +292,7 @@ fn delim_to_str(d: tt::Delimiter, closing: bool) -> SmolStr {
     };
 
     let idx = closing as usize;
-    let text = if texts.len() > 0 { &texts[idx..texts.len() - (1 - idx)] } else { "" };
+    let text = if !texts.is_empty() { &texts[idx..texts.len() - (1 - idx)] } else { "" };
     text.into()
 }