Fix function calls

crates/ra_syntax/src/lexer/ptr.rs

@@ -31,7 +31,7 @@ impl<'s> Ptr<'s> {
     /// For example, 0 will return the current token, 1 will return the next, etc.
     pub fn nth(&self, n: u32) -> Option<char> {
         let mut chars = self.chars().peekable();
-        chars.by_ref().skip(n as usize).next()
+        chars.by_ref().nth(n as usize)
     }
 
     /// Checks whether the current character is `c`.

crates/ra_syntax/src/reparsing.rs

@@ -135,7 +135,7 @@ fn find_reparsable_node(
 }
 
 fn is_balanced(tokens: &[Token]) -> bool {
-    if tokens.len() == 0
+    if tokens.is_empty()
         || tokens.first().unwrap().kind != L_CURLY
         || tokens.last().unwrap().kind != R_CURLY
     {

crates/ra_syntax/src/utils.rs

@@ -5,7 +5,7 @@ use std::fmt::Write;
 
 /// Parse a file and create a string representation of the resulting parse tree.
 pub fn dump_tree(syntax: SyntaxNodeRef) -> String {
-    let mut errors: Vec<_> = syntax.root_data().iter().cloned().collect();
+    let mut errors: Vec<_> = syntax.root_data().to_vec();
     errors.sort_by_key(|e| e.offset);
     let mut err_pos = 0;
     let mut level = 0;