Rename RefTokenTreeCursor.

Because `TokenStreamIter` is a much better name for a `TokenStream`
iterator. Also rename the `TokenStream::trees` method as
`TokenStream::iter`, and some local variables.

Author: nnethercote

clippy_lints/src/attrs/should_panic_without_expect.rs

@@ -15,7 +15,7 @@ pub(super) fn check(cx: &EarlyContext<'_>, attr: &Attribute) {
         }
 
         if let AttrArgs::Delimited(args) = &normal_attr.item.args
-            && let mut tt_iter = args.tokens.trees()
+            && let mut tt_iter = args.tokens.iter()
             && let Some(TokenTree::Token(
                 Token {
                     kind: TokenKind::Ident(sym::expected, _),

clippy_lints/src/crate_in_macro_def.rs

@@ -82,11 +82,11 @@ fn is_macro_export(attr: &Attribute) -> bool {
 
 fn contains_unhygienic_crate_reference(tts: &TokenStream) -> Option<Span> {
     let mut prev_is_dollar = false;
-    let mut cursor = tts.trees();
-    while let Some(curr) = cursor.next() {
+    let mut iter = tts.iter();
+    while let Some(curr) = iter.next() {
         if !prev_is_dollar
             && let Some(span) = is_crate_keyword(curr)
-            && let Some(next) = cursor.peek()
+            && let Some(next) = iter.peek()
             && is_token(next, &TokenKind::PathSep)
         {
             return Some(span);