syntax: unbox closures used in let bindings

src/libsyntax/ext/deriving/default.rs

@@ -55,7 +55,7 @@ fn default_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructur
         cx.ident_of("Default"),
         cx.ident_of("default")
     );
-    let default_call = |span| cx.expr_call_global(span, default_ident.clone(), Vec::new());
+    let default_call = |&: span| cx.expr_call_global(span, default_ident.clone(), Vec::new());
 
     return match *substr.fields {
         StaticStruct(_, ref summary) => {

src/libsyntax/ext/deriving/generic/mod.rs

@@ -935,7 +935,7 @@ impl<'a> MethodDef<'a> {
         // where each tuple has length = self_args.len()
         let mut match_arms: Vec<ast::Arm> = variants.iter().enumerate()
             .map(|(index, variant)| {
-                let mk_self_pat = |cx: &mut ExtCtxt, self_arg_name: &str| {
+                let mk_self_pat = |&: cx: &mut ExtCtxt, self_arg_name: &str| {
                     let (p, idents) = trait_.create_enum_variant_pattern(cx, type_ident,
                                                                          &**variant,
                                                                          self_arg_name,

src/libsyntax/ext/deriving/hash.rs

@@ -71,7 +71,7 @@ fn hash_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure)
         _ => cx.span_bug(trait_span, "incorrect number of arguments in `deriving(Hash)`")
     };
     let hash_ident = substr.method_ident;
-    let call_hash = |span, thing_expr| {
+    let call_hash = |&: span, thing_expr| {
         let expr = cx.expr_method_call(span, thing_expr, hash_ident, vec!(state_expr.clone()));
         cx.stmt_expr(expr)
     };

src/libsyntax/ext/deriving/zero.rs

@@ -71,7 +71,7 @@ fn zero_substructure(cx: &mut ExtCtxt, trait_span: Span, substr: &Substructure)
         cx.ident_of("Zero"),
         cx.ident_of("zero")
     );
-    let zero_call = |span| cx.expr_call_global(span, zero_ident.clone(), Vec::new());
+    let zero_call = |&: span| cx.expr_call_global(span, zero_ident.clone(), Vec::new());
 
     return match *substr.fields {
         StaticStruct(_, ref summary) => {

src/libsyntax/ext/expand.rs

@@ -1660,7 +1660,7 @@ mod test {
             assert!((shouldmatch.len() == 0) ||
                     (varrefs.len() > *shouldmatch.iter().max().unwrap()));
             for (idx,varref) in varrefs.iter().enumerate() {
-                let print_hygiene_debug_info = || {
+                let print_hygiene_debug_info = |&:| {
                     // good lord, you can't make a path with 0 segments, can you?
                     let final_varref_ident = match varref.segments.last() {
                         Some(pathsegment) => pathsegment.identifier,

src/libsyntax/ext/quote.rs

@@ -800,11 +800,11 @@ fn expand_parse_call(cx: &ExtCtxt,
                      tts: &[ast::TokenTree]) -> P<ast::Expr> {
     let (cx_expr, tts_expr) = expand_tts(cx, sp, tts);
 
-    let cfg_call = || cx.expr_method_call(
+    let cfg_call = |&:| cx.expr_method_call(
         sp, cx.expr_ident(sp, id_ext("ext_cx")),
         id_ext("cfg"), Vec::new());
 
-    let parse_sess_call = || cx.expr_method_call(
+    let parse_sess_call = |&:| cx.expr_method_call(
         sp, cx.expr_ident(sp, id_ext("ext_cx")),
         id_ext("parse_sess"), Vec::new());
 

src/libsyntax/parse/mod.rs

@@ -240,7 +240,7 @@ pub fn new_parser_from_tts<'a>(sess: &'a ParseSess,
 /// add the path to the session's codemap and return the new filemap.
 pub fn file_to_filemap(sess: &ParseSess, path: &Path, spanopt: Option<Span>)
     -> Rc<FileMap> {
-    let err = |msg: &str| {
+    let err = |&: msg: &str| {
         match spanopt {
             Some(sp) => sess.span_diagnostic.span_fatal(sp, msg),
             None => sess.span_diagnostic.handler().fatal(msg),
@@ -399,7 +399,7 @@ pub fn char_lit(lit: &str) -> (char, int) {
         .map(|x| (x, len as int))
     }
 
-    let unicode_escape: || -> Option<(char, int)> = ||
+    let unicode_escape = |&: | -> Option<(char, int)>
         if lit.as_bytes()[2] == b'{' {
             let idx = lit.find('}').expect(msg2);
             let subslice = lit[3..idx];
@@ -426,7 +426,7 @@ pub fn str_lit(lit: &str) -> String {
     let mut res = String::with_capacity(lit.len());
 
     // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
-    let error = |i| format!("lexer should have rejected {} at {}", lit, i);
+    let error = |&: i| format!("lexer should have rejected {} at {}", lit, i);
 
     /// Eat everything up to a non-whitespace
     fn eat<'a>(it: &mut iter::Peekable<(uint, char), str::CharIndices<'a>>) {
@@ -561,7 +561,7 @@ pub fn float_lit(s: &str, suffix: Option<&str>, sd: &SpanHandler, sp: Span) -> a
 
 /// Parse a string representing a byte literal into its final form. Similar to `char_lit`
 pub fn byte_lit(lit: &str) -> (u8, uint) {
-    let err = |i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
+    let err = |&: i| format!("lexer accepted invalid byte literal {} step {}", lit, i);
 
     if lit.len() == 1 {
         (lit.as_bytes()[0], 1)
@@ -595,7 +595,7 @@ pub fn binary_lit(lit: &str) -> Rc<Vec<u8>> {
     let mut res = Vec::with_capacity(lit.len());
 
     // FIXME #8372: This could be a for-loop if it didn't borrow the iterator
-    let error = |i| format!("lexer should have rejected {} at {}", lit, i);
+    let error = |&: i| format!("lexer should have rejected {} at {}", lit, i);
 
     /// Eat everything up to a non-whitespace
     fn eat<'a, I: Iterator<(uint, u8)>>(it: &mut iter::Peekable<(uint, u8), I>) {

src/libsyntax/test.rs

@@ -545,11 +545,11 @@ fn mk_test_desc_and_fn_rec(cx: &TestCtxt, test: &Test) -> P<ast::Expr> {
     let test_id = ecx.ident_of("test");
 
     // creates self::test::$name
-    let test_path = |name| {
+    let test_path = |&: name| {
         ecx.path(span, vec![self_id, test_id, ecx.ident_of(name)])
     };
     // creates $name: $expr
-    let field = |name, expr| ecx.field_imm(span, ecx.ident_of(name), expr);
+    let field = |&: name, expr| ecx.field_imm(span, ecx.ident_of(name), expr);
 
     debug!("encoding {}", ast_util::path_name_i(path[]));
 
@@ -563,7 +563,7 @@ fn mk_test_desc_and_fn_rec(cx: &TestCtxt, test: &Test) -> P<ast::Expr> {
                                   vec![name_expr]);
 
     let ignore_expr = ecx.expr_bool(span, test.ignore);
-    let should_fail_path = |name| {
+    let should_fail_path = |&: name| {
         ecx.path(span, vec![self_id, test_id, ecx.ident_of("ShouldFail"), ecx.ident_of(name)])
     };
     let fail_expr = match test.should_fail {